2167 lines
71 KiB
C++
2167 lines
71 KiB
C++
// This file is distributed under the BSD License.
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// See "license.txt" for details.
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// Copyright 2009-2012, Jonathan Turner (jonathan@emptycrate.com)
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// Copyright 2009-2015, Jason Turner (jason@emptycrate.com)
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// http://www.chaiscript.com
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#ifndef CHAISCRIPT_PARSER_HPP_
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#define CHAISCRIPT_PARSER_HPP_
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#include <cstdint>
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#include <cstring>
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#include <exception>
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#include <fstream>
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#include <iostream>
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#include <memory>
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#include <sstream>
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#include <string>
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#include <vector>
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#include "../dispatchkit/boxed_value.hpp"
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#include "chaiscript_common.hpp"
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namespace chaiscript
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{
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/// \brief Classes and functions used during the parsing process.
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namespace parser
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{
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/// \brief Classes and functions internal to the parsing process. Not supported for the end user.
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namespace detail
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{
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enum Alphabet
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{ symbol_alphabet = 0
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, keyword_alphabet
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, int_alphabet
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, float_alphabet
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, x_alphabet
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, hex_alphabet
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, b_alphabet
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, bin_alphabet
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, id_alphabet
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, white_alphabet
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, int_suffix_alphabet
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, float_suffix_alphabet
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, max_alphabet
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, lengthof_alphabet = 256
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};
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}
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class ChaiScript_Parser {
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std::string::const_iterator m_input_pos, m_input_end;
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int m_line, m_col;
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std::string m_multiline_comment_begin;
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std::string m_multiline_comment_end;
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std::string m_singleline_comment;
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std::shared_ptr<std::string> m_filename;
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std::vector<AST_NodePtr> m_match_stack;
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bool m_alphabet[detail::max_alphabet][detail::lengthof_alphabet];
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std::vector<std::vector<std::string>> m_operator_matches;
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std::vector<AST_Node_Type::Type> m_operators;
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public:
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ChaiScript_Parser()
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: m_line(-1), m_col(-1),
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m_multiline_comment_begin("/*"),
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m_multiline_comment_end("*/"),
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m_singleline_comment("//")
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{
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setup_operators();
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}
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ChaiScript_Parser(const ChaiScript_Parser &) = delete;
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ChaiScript_Parser &operator=(const ChaiScript_Parser &) = delete;
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void setup_operators()
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{
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m_operators.emplace_back(AST_Node_Type::Ternary_Cond);
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m_operator_matches.emplace_back(std::initializer_list<std::string>({"?"}));
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m_operators.emplace_back(AST_Node_Type::Logical_Or);
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m_operator_matches.emplace_back(std::initializer_list<std::string>({"||"}));
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m_operators.emplace_back(AST_Node_Type::Logical_And);
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m_operator_matches.emplace_back(std::initializer_list<std::string>({"&&"}));
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m_operators.emplace_back(AST_Node_Type::Bitwise_Or);
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m_operator_matches.emplace_back(std::initializer_list<std::string>({"|"}));
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m_operators.emplace_back(AST_Node_Type::Bitwise_Xor);
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m_operator_matches.emplace_back(std::initializer_list<std::string>({"^"}));
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m_operators.emplace_back(AST_Node_Type::Bitwise_And);
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m_operator_matches.emplace_back(std::initializer_list<std::string>({"&"}));
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m_operators.emplace_back(AST_Node_Type::Equality);
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m_operator_matches.emplace_back(std::initializer_list<std::string>({"==", "!="}));
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m_operators.emplace_back(AST_Node_Type::Comparison);
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m_operator_matches.emplace_back(std::initializer_list<std::string>({"<", "<=", ">", ">="}));
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m_operators.emplace_back(AST_Node_Type::Shift);
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m_operator_matches.emplace_back(std::initializer_list<std::string>({"<<", ">>"}));
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//We share precedence here but then separate them later
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m_operators.emplace_back(AST_Node_Type::Addition);
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m_operator_matches.emplace_back(std::initializer_list<std::string>({"+", "-"}));
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//We share precedence here but then separate them later
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m_operators.emplace_back(AST_Node_Type::Multiplication);
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m_operator_matches.emplace_back(std::initializer_list<std::string>({"*", "/", "%"}));
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for (auto & elem : m_alphabet) {
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std::fill(std::begin(elem), std::end(elem), false);
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}
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m_alphabet[detail::symbol_alphabet][static_cast<int>('?')]=true;
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m_alphabet[detail::symbol_alphabet][static_cast<int>('+')]=true;
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m_alphabet[detail::symbol_alphabet][static_cast<int>('-')]=true;
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m_alphabet[detail::symbol_alphabet][static_cast<int>('*')]=true;
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m_alphabet[detail::symbol_alphabet][static_cast<int>('/')]=true;
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m_alphabet[detail::symbol_alphabet][static_cast<int>('|')]=true;
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m_alphabet[detail::symbol_alphabet][static_cast<int>('&')]=true;
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m_alphabet[detail::symbol_alphabet][static_cast<int>('^')]=true;
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m_alphabet[detail::symbol_alphabet][static_cast<int>('=')]=true;
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m_alphabet[detail::symbol_alphabet][static_cast<int>('.')]=true;
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m_alphabet[detail::symbol_alphabet][static_cast<int>('<')]=true;
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m_alphabet[detail::symbol_alphabet][static_cast<int>('>')]=true;
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for ( int c = 'a' ; c <= 'z' ; ++c ) { m_alphabet[detail::keyword_alphabet][c]=true; }
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for ( int c = 'A' ; c <= 'Z' ; ++c ) { m_alphabet[detail::keyword_alphabet][c]=true; }
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for ( int c = '0' ; c <= '9' ; ++c ) { m_alphabet[detail::keyword_alphabet][c]=true; }
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m_alphabet[detail::keyword_alphabet][static_cast<int>('_')]=true;
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for ( int c = '0' ; c <= '9' ; ++c ) { m_alphabet[detail::int_alphabet][c]=true; }
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for ( int c = '0' ; c <= '9' ; ++c ) { m_alphabet[detail::float_alphabet][c]=true; }
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m_alphabet[detail::float_alphabet][static_cast<int>('.')]=true;
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for ( int c = '0' ; c <= '9' ; ++c ) { m_alphabet[detail::hex_alphabet][c]=true; }
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for ( int c = 'a' ; c <= 'f' ; ++c ) { m_alphabet[detail::hex_alphabet][c]=true; }
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for ( int c = 'A' ; c <= 'F' ; ++c ) { m_alphabet[detail::hex_alphabet][c]=true; }
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m_alphabet[detail::x_alphabet][static_cast<int>('x')]=true;
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m_alphabet[detail::x_alphabet][static_cast<int>('X')]=true;
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for ( int c = '0' ; c <= '1' ; ++c ) { m_alphabet[detail::bin_alphabet][c]=true; }
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m_alphabet[detail::b_alphabet][static_cast<int>('b')]=true;
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m_alphabet[detail::b_alphabet][static_cast<int>('B')]=true;
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for ( int c = 'a' ; c <= 'z' ; ++c ) { m_alphabet[detail::id_alphabet][c]=true; }
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for ( int c = 'A' ; c <= 'Z' ; ++c ) { m_alphabet[detail::id_alphabet][c]=true; }
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m_alphabet[detail::id_alphabet][static_cast<int>('_')] = true;
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m_alphabet[detail::white_alphabet][static_cast<int>(' ')]=true;
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m_alphabet[detail::white_alphabet][static_cast<int>('\t')]=true;
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m_alphabet[detail::int_suffix_alphabet][static_cast<int>('l')] = true;
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m_alphabet[detail::int_suffix_alphabet][static_cast<int>('L')] = true;
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m_alphabet[detail::int_suffix_alphabet][static_cast<int>('u')] = true;
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m_alphabet[detail::int_suffix_alphabet][static_cast<int>('U')] = true;
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m_alphabet[detail::float_suffix_alphabet][static_cast<int>('l')] = true;
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m_alphabet[detail::float_suffix_alphabet][static_cast<int>('L')] = true;
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m_alphabet[detail::float_suffix_alphabet][static_cast<int>('f')] = true;
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m_alphabet[detail::float_suffix_alphabet][static_cast<int>('F')] = true;
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}
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/// test a char in an m_alphabet
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bool char_in_alphabet(char c, detail::Alphabet a) const { return m_alphabet[a][static_cast<int>(c)]; }
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/// Prints the parsed ast_nodes as a tree
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/*
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void debug_print(AST_NodePtr t, std::string prepend = "") {
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std::cout << prepend << "(" << ast_node_type_to_string(t->identifier) << ") " << t->text << " : " << t->start.line << ", " << t->start.column << '\n';
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for (unsigned int j = 0; j < t->children.size(); ++j) {
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debug_print(t->children[j], prepend + " ");
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}
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}
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*/
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/// Shows the current stack of matched ast_nodes
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void show_match_stack() const {
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for (auto & elem : m_match_stack) {
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//debug_print(match_stack[i]);
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std::cout << elem->to_string();
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}
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}
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/// Clears the stack of matched ast_nodes
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void clear_match_stack() {
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m_match_stack.clear();
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}
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/// Returns the front-most AST node
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AST_NodePtr ast() const {
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return m_match_stack.front();
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}
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/// Helper function that collects ast_nodes from a starting position to the top of the stack into a new AST node
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void build_match(AST_NodePtr t_t, size_t t_match_start) {
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int pos_line_start, pos_col_start, pos_line_stop, pos_col_stop;
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bool is_deep = false;
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//so we want to take everything to the right of this and make them children
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if (t_match_start != m_match_stack.size()) {
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pos_line_start = m_match_stack[t_match_start]->start.line;
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pos_col_start = m_match_stack[t_match_start]->start.column;
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pos_line_stop = m_line;
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pos_col_stop = m_col;
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is_deep = true;
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}
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else {
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pos_line_start = m_line;
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pos_col_start = m_col;
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pos_line_stop = m_line;
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pos_col_stop = m_col;
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}
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t_t->filename = m_filename;
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t_t->start.line = pos_line_start;
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t_t->start.column = pos_col_start;
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t_t->end.line = pos_line_stop;
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t_t->end.column = pos_col_stop;
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if (is_deep) {
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t_t->children.assign(m_match_stack.begin() + static_cast<int>(t_match_start), m_match_stack.end());
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m_match_stack.erase(m_match_stack.begin() + static_cast<int>(t_match_start), m_match_stack.end());
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}
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/// \todo fix the fact that a successful match that captured no ast_nodes doesn't have any real start position
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m_match_stack.push_back(std::move(t_t));
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}
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/// Check to see if there is more text parse
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inline bool has_more_input() const {
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return (m_input_pos != m_input_end);
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}
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/// Skips any multi-line or single-line comment
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bool SkipComment() {
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if (Symbol_(m_multiline_comment_begin.c_str())) {
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while (m_input_pos != m_input_end) {
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if (Symbol_(m_multiline_comment_end.c_str())) {
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break;
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} else if (!Eol_()) {
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++m_col;
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++m_input_pos;
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}
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}
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return true;
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} else if (Symbol_(m_singleline_comment.c_str())) {
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while (m_input_pos != m_input_end) {
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if (Symbol_("\r\n")) {
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m_input_pos -= 2;
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break;
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} else if (Char_('\n')) {
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--m_input_pos;
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break;
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} else {
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++m_col;
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++m_input_pos;
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}
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}
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return true;
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}
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return false;
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}
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/// Skips ChaiScript whitespace, which means space and tab, but not cr/lf
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/// jespada: Modified SkipWS to skip optionally CR ('\n') and/or LF+CR ("\r\n")
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bool SkipWS(bool skip_cr=false) {
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bool retval = false;
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while (has_more_input()) {
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auto end_line = (*m_input_pos != 0) && ((*m_input_pos == '\n') || (*m_input_pos == '\r' && *(m_input_pos+1) == '\n'));
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if ( char_in_alphabet(*m_input_pos,detail::white_alphabet) || (skip_cr && end_line)) {
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if(end_line) {
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m_col = 1;
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++m_line;
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if(*(m_input_pos) == '\r') {
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// discards lf
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++m_input_pos;
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}
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}
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else {
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++m_col;
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}
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++m_input_pos;
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retval = true;
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}
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else if (SkipComment()) {
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retval = true;
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} else {
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break;
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}
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}
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return retval;
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}
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/// Reads a floating point value from input, without skipping initial whitespace
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bool Float_() {
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if (has_more_input() && char_in_alphabet(*m_input_pos,detail::float_alphabet) ) {
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while (has_more_input() && char_in_alphabet(*m_input_pos,detail::int_alphabet) ) {
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++m_input_pos;
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++m_col;
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}
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if (has_more_input() && (*m_input_pos == '.')) {
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++m_input_pos;
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++m_col;
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if (has_more_input() && char_in_alphabet(*m_input_pos,detail::int_alphabet)) {
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while (has_more_input() && char_in_alphabet(*m_input_pos,detail::int_alphabet) ) {
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++m_input_pos;
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++m_col;
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}
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while (has_more_input() && char_in_alphabet(*m_input_pos, detail::float_suffix_alphabet))
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{
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++m_input_pos;
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++m_col;
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}
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return true;
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} else {
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--m_input_pos;
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--m_col;
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}
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}
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}
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return false;
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}
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/// Reads a hex value from input, without skipping initial whitespace
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bool Hex_() {
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if (has_more_input() && (*m_input_pos == '0')) {
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++m_input_pos;
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++m_col;
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if (has_more_input() && char_in_alphabet(*m_input_pos, detail::x_alphabet) ) {
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++m_input_pos;
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++m_col;
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if (has_more_input() && char_in_alphabet(*m_input_pos, detail::hex_alphabet)) {
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while (has_more_input() && char_in_alphabet(*m_input_pos, detail::hex_alphabet) ) {
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++m_input_pos;
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++m_col;
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}
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while (has_more_input() && char_in_alphabet(*m_input_pos, detail::int_suffix_alphabet))
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{
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++m_input_pos;
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++m_col;
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}
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return true;
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}
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else {
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--m_input_pos;
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--m_col;
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}
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}
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else {
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--m_input_pos;
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--m_col;
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}
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}
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return false;
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}
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/// Reads an integer suffix
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void IntSuffix_() {
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while (has_more_input() && char_in_alphabet(*m_input_pos, detail::int_suffix_alphabet))
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{
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++m_input_pos;
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++m_col;
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}
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}
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/// Reads a binary value from input, without skipping initial whitespace
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bool Binary_() {
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if (has_more_input() && (*m_input_pos == '0')) {
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++m_input_pos;
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++m_col;
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if (has_more_input() && char_in_alphabet(*m_input_pos, detail::b_alphabet) ) {
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++m_input_pos;
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++m_col;
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if (has_more_input() && char_in_alphabet(*m_input_pos, detail::bin_alphabet) ) {
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while (has_more_input() && char_in_alphabet(*m_input_pos, detail::bin_alphabet) ) {
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++m_input_pos;
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++m_col;
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}
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return true;
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} else {
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--m_input_pos;
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--m_col;
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}
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} else {
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--m_input_pos;
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--m_col;
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}
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}
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return false;
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}
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/// Parses a floating point value and returns a Boxed_Value representation of it
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static Boxed_Value buildFloat(const std::string &t_val)
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{
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bool float_ = false;
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bool long_ = false;
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auto i = t_val.size();
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for (; i > 0; --i)
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{
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char val = t_val[i-1];
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if (val == 'f' || val == 'F')
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{
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float_ = true;
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} else if (val == 'l' || val == 'L') {
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long_ = true;
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} else {
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break;
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}
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}
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if (float_)
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{
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return const_var(std::stof(t_val.substr(0,i)));
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} else if (long_) {
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return const_var(std::stold(t_val.substr(0,i)));
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} else {
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return const_var(std::stod(t_val.substr(0,i)));
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}
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}
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template<typename IntType>
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static Boxed_Value buildInt(const IntType &t_type, const std::string &t_val)
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{
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bool unsigned_ = false;
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bool long_ = false;
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bool longlong_ = false;
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auto i = t_val.size();
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for (; i > 0; --i)
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{
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const char val = t_val[i-1];
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if (val == 'u' || val == 'U')
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{
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unsigned_ = true;
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} else if (val == 'l' || val == 'L') {
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if (long_)
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{
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longlong_ = true;
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}
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long_ = true;
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} else {
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|
break;
|
|
}
|
|
}
|
|
|
|
std::stringstream ss(t_val.substr(0, i));
|
|
ss >> t_type;
|
|
|
|
std::stringstream testu(t_val.substr(0, i));
|
|
uint64_t u;
|
|
testu >> t_type >> u;
|
|
|
|
bool unsignedrequired = false;
|
|
|
|
if ((u >> (sizeof(int) * 8)) > 0)
|
|
{
|
|
//requires something bigger than int
|
|
long_ = true;
|
|
}
|
|
|
|
static_assert(sizeof(long) == sizeof(uint64_t) || sizeof(long) * 2 == sizeof(uint64_t), "Unexpected sizing of integer types");
|
|
|
|
if ((sizeof(long) < sizeof(uint64_t))
|
|
&& (u >> ((sizeof(uint64_t) - sizeof(long)) * 8)) > 0)
|
|
{
|
|
//requires something bigger than long
|
|
longlong_ = true;
|
|
}
|
|
|
|
|
|
size_t size = sizeof(int) * 8;
|
|
|
|
if (longlong_)
|
|
{
|
|
size = sizeof(int64_t) * 8;
|
|
} else if (long_) {
|
|
size = sizeof(long) * 8;
|
|
}
|
|
|
|
if ( (u >> (size - 1)) > 0)
|
|
{
|
|
unsignedrequired = true;
|
|
}
|
|
|
|
if (unsignedrequired && !unsigned_)
|
|
{
|
|
if (t_type == &std::hex || t_type == &std::oct)
|
|
{
|
|
// with hex and octal we are happy to just make it unsigned
|
|
unsigned_ = true;
|
|
} else {
|
|
// with decimal we must bump it up to the next size
|
|
if (long_)
|
|
{
|
|
longlong_ = true;
|
|
} else if (!long_ && !longlong_) {
|
|
long_ = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (unsigned_)
|
|
{
|
|
if (longlong_)
|
|
{
|
|
uint64_t val;
|
|
ss >> val;
|
|
return const_var(val);
|
|
} else if (long_) {
|
|
unsigned long val;
|
|
ss >> val;
|
|
return const_var(val);
|
|
} else {
|
|
unsigned int val;
|
|
ss >> val;
|
|
return const_var(val);
|
|
}
|
|
} else {
|
|
if (longlong_)
|
|
{
|
|
int64_t val;
|
|
ss >> val;
|
|
return const_var(val);
|
|
} else if (long_) {
|
|
long val;
|
|
ss >> val;
|
|
return const_var(val);
|
|
} else {
|
|
int val;
|
|
ss >> val;
|
|
return const_var(val);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Reads a number from the input, detecting if it's an integer or floating point
|
|
bool Num(const bool t_capture = false) {
|
|
SkipWS();
|
|
|
|
if (!t_capture) {
|
|
return Hex_() || Float_();
|
|
} else {
|
|
const auto start = m_input_pos;
|
|
const auto prev_col = m_col;
|
|
const auto prev_line = m_line;
|
|
if (has_more_input() && char_in_alphabet(*m_input_pos, detail::float_alphabet) ) {
|
|
if (Hex_()) {
|
|
std::string match(start, m_input_pos);
|
|
m_match_stack.emplace_back(std::make_shared<eval::Int_AST_Node>(std::move(match), buildInt(std::hex, match), m_filename, prev_line, prev_col, m_line, m_col));
|
|
return true;
|
|
}
|
|
|
|
if (Binary_()) {
|
|
std::string match(start, m_input_pos);
|
|
int64_t temp_int = 0;
|
|
size_t pos = 0;
|
|
const auto end = match.length();
|
|
|
|
while ((pos < end) && (pos < (2 + sizeof(int) * 8))) {
|
|
temp_int <<= 1;
|
|
if (match[pos] == '1') {
|
|
temp_int += 1;
|
|
}
|
|
++pos;
|
|
}
|
|
|
|
Boxed_Value i;
|
|
if (match.length() <= sizeof(int) * 8)
|
|
{
|
|
i = const_var(static_cast<int>(temp_int));
|
|
} else {
|
|
i = const_var(temp_int);
|
|
}
|
|
|
|
m_match_stack.push_back(std::make_shared<eval::Int_AST_Node>(std::move(match), std::move(i), m_filename, prev_line, prev_col, m_line, m_col));
|
|
return true;
|
|
}
|
|
if (Float_()) {
|
|
std::string match(start, m_input_pos);
|
|
m_match_stack.push_back(std::make_shared<eval::Float_AST_Node>(std::move(match), buildFloat(match), m_filename, prev_line, prev_col, m_line, m_col));
|
|
return true;
|
|
}
|
|
else {
|
|
IntSuffix_();
|
|
std::string match(start, m_input_pos);
|
|
if (!match.empty() && (match[0] == '0')) {
|
|
m_match_stack.push_back(std::make_shared<eval::Int_AST_Node>(std::move(match), buildInt(std::oct, match), m_filename, prev_line, prev_col, m_line, m_col));
|
|
}
|
|
else {
|
|
m_match_stack.push_back(std::make_shared<eval::Int_AST_Node>(std::move(match), buildInt(std::dec, match), m_filename, prev_line, prev_col, m_line, m_col));
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Reads an identifier from input which conforms to C's identifier naming conventions, without skipping initial whitespace
|
|
bool Id_() {
|
|
if (has_more_input() && char_in_alphabet(*m_input_pos, detail::id_alphabet)) {
|
|
while (has_more_input() && char_in_alphabet(*m_input_pos, detail::keyword_alphabet) ) {
|
|
++m_input_pos;
|
|
++m_col;
|
|
}
|
|
|
|
return true;
|
|
} else if (has_more_input() && (*m_input_pos == '`')) {
|
|
++m_col;
|
|
++m_input_pos;
|
|
const auto start = m_input_pos;
|
|
|
|
while (has_more_input() && (*m_input_pos != '`')) {
|
|
if (Eol()) {
|
|
throw exception::eval_error("Carriage return in identifier literal", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
else {
|
|
++m_input_pos;
|
|
++m_col;
|
|
}
|
|
}
|
|
|
|
if (start == m_input_pos) {
|
|
throw exception::eval_error("Missing contents of identifier literal", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
else if (m_input_pos == m_input_end) {
|
|
throw exception::eval_error("Incomplete identifier literal", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
++m_col;
|
|
++m_input_pos;
|
|
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// Reads (and potentially captures) an identifier from input
|
|
bool Id(const bool t_capture = false) {
|
|
SkipWS();
|
|
|
|
if (!t_capture) {
|
|
return Id_();
|
|
} else {
|
|
const auto start = m_input_pos;
|
|
const int prev_col = m_col;
|
|
const int prev_line = m_line;
|
|
if (Id_()) {
|
|
std::string match;
|
|
if (*start == '`') {
|
|
//Id Literal
|
|
match = std::string(start+1, m_input_pos-1);
|
|
} else {
|
|
match = std::string(start, m_input_pos);
|
|
}
|
|
m_match_stack.push_back(std::make_shared<eval::Id_AST_Node>(std::move(match), m_filename, prev_line, prev_col, m_line, m_col));
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Reads an argument from input
|
|
bool Arg() {
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
SkipWS();
|
|
|
|
if (!Id(true)) {
|
|
return false;
|
|
}
|
|
|
|
SkipWS();
|
|
Id(true);
|
|
|
|
build_match(std::make_shared<eval::Arg_AST_Node>(), prev_stack_top);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
|
|
/// Checks for a node annotation of the form "#<annotation>"
|
|
bool Annotation() {
|
|
SkipWS();
|
|
const auto start = m_input_pos;
|
|
const auto prev_col = m_col;
|
|
const auto prev_line = m_line;
|
|
if (Symbol_("#")) {
|
|
do {
|
|
while (m_input_pos != m_input_end) {
|
|
if (Eol_()) {
|
|
break;
|
|
}
|
|
else {
|
|
++m_col;
|
|
++m_input_pos;
|
|
}
|
|
}
|
|
} while (Symbol("#"));
|
|
|
|
std::string match(start, m_input_pos);
|
|
m_match_stack.push_back(std::make_shared<eval::Annotation_AST_Node>(std::move(match), m_filename, prev_line, prev_col, m_line, m_col));
|
|
return true;
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/// Reads a quoted string from input, without skipping initial whitespace
|
|
bool Quoted_String_() {
|
|
if (has_more_input() && (*m_input_pos == '\"')) {
|
|
char prev_char = *m_input_pos;
|
|
++m_input_pos;
|
|
++m_col;
|
|
|
|
while (has_more_input() && ((*m_input_pos != '\"') || ((*m_input_pos == '\"') && (prev_char == '\\')))) {
|
|
if (!Eol_()) {
|
|
if (prev_char == '\\') {
|
|
prev_char = 0;
|
|
} else {
|
|
prev_char = *m_input_pos;
|
|
}
|
|
++m_input_pos;
|
|
++m_col;
|
|
}
|
|
}
|
|
|
|
if (has_more_input()) {
|
|
++m_input_pos;
|
|
++m_col;
|
|
} else {
|
|
throw exception::eval_error("Unclosed quoted string", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// Reads (and potentially captures) a quoted string from input. Translates escaped sequences.
|
|
bool Quoted_String(const bool t_capture = false) {
|
|
SkipWS();
|
|
|
|
if (!t_capture) {
|
|
return Quoted_String_();
|
|
} else {
|
|
const auto start = m_input_pos;
|
|
const auto prev_col = m_col;
|
|
const auto prev_line = m_line;
|
|
|
|
if (Quoted_String_()) {
|
|
std::string match;
|
|
bool is_escaped = false;
|
|
bool is_interpolated = false;
|
|
bool saw_interpolation_marker = false;
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
std::string::const_iterator s = start + 1, end = m_input_pos - 1;
|
|
|
|
while (s != end) {
|
|
if (saw_interpolation_marker) {
|
|
if (*s == '{') {
|
|
//We've found an interpolation point
|
|
|
|
if (is_interpolated) {
|
|
//If we've seen previous interpolation, add on instead of making a new one
|
|
m_match_stack.push_back(std::make_shared<eval::Quoted_String_AST_Node>(match, m_filename, prev_line, prev_col, m_line, m_col));
|
|
|
|
build_match(std::make_shared<eval::Binary_Operator_AST_Node>("+"), prev_stack_top);
|
|
} else {
|
|
m_match_stack.push_back(std::make_shared<eval::Quoted_String_AST_Node>(match, m_filename, prev_line, prev_col, m_line, m_col));
|
|
}
|
|
|
|
//We've finished with the part of the string up to this point, so clear it
|
|
match.clear();
|
|
|
|
std::string eval_match;
|
|
|
|
++s;
|
|
while ((s != end) && (*s != '}')) {
|
|
eval_match.push_back(*s);
|
|
++s;
|
|
}
|
|
|
|
if (*s == '}') {
|
|
is_interpolated = true;
|
|
++s;
|
|
|
|
const auto tostr_stack_top = m_match_stack.size();
|
|
|
|
m_match_stack.push_back(std::make_shared<eval::Id_AST_Node>("to_string", m_filename, prev_line, prev_col, m_line, m_col));
|
|
|
|
const auto ev_stack_top = m_match_stack.size();
|
|
|
|
/// \todo can we evaluate this in place and save the runtime cost of evaluating with each execution of the node?
|
|
m_match_stack.push_back(std::make_shared<eval::Id_AST_Node>("eval", m_filename, prev_line, prev_col, m_line, m_col));
|
|
|
|
const auto arg_stack_top = m_match_stack.size();
|
|
|
|
m_match_stack.push_back(std::make_shared<eval::Quoted_String_AST_Node>(eval_match, m_filename, prev_line, prev_col, m_line, m_col));
|
|
|
|
build_match(std::make_shared<eval::Arg_List_AST_Node>(), arg_stack_top);
|
|
build_match(std::make_shared<eval::Inplace_Fun_Call_AST_Node>(), ev_stack_top);
|
|
build_match(std::make_shared<eval::Arg_List_AST_Node>(), ev_stack_top);
|
|
build_match(std::make_shared<eval::Fun_Call_AST_Node>(), tostr_stack_top);
|
|
build_match(std::make_shared<eval::Binary_Operator_AST_Node>("+"), prev_stack_top);
|
|
} else {
|
|
throw exception::eval_error("Unclosed in-string eval", File_Position(prev_line, prev_col), *m_filename);
|
|
}
|
|
} else {
|
|
match.push_back('$');
|
|
}
|
|
saw_interpolation_marker = false;
|
|
} else {
|
|
if (*s == '\\') {
|
|
if (is_escaped) {
|
|
match.push_back('\\');
|
|
is_escaped = false;
|
|
} else {
|
|
is_escaped = true;
|
|
}
|
|
} else {
|
|
if (is_escaped) {
|
|
switch (*s) {
|
|
case ('b') : match.push_back('\b'); break;
|
|
case ('f') : match.push_back('\f'); break;
|
|
case ('n') : match.push_back('\n'); break;
|
|
case ('r') : match.push_back('\r'); break;
|
|
case ('t') : match.push_back('\t'); break;
|
|
case ('\'') : match.push_back('\''); break;
|
|
case ('\"') : match.push_back('\"'); break;
|
|
case ('$') : match.push_back('$'); break;
|
|
default: throw exception::eval_error("Unknown escaped sequence in string", File_Position(prev_line, prev_col), *m_filename);
|
|
}
|
|
} else if (*s == '$') {
|
|
saw_interpolation_marker = true;
|
|
} else {
|
|
match.push_back(*s);
|
|
}
|
|
is_escaped = false;
|
|
}
|
|
++s;
|
|
}
|
|
}
|
|
|
|
if (is_interpolated) {
|
|
m_match_stack.push_back(std::make_shared<eval::Quoted_String_AST_Node>(match, m_filename, prev_line, prev_col, m_line, m_col));
|
|
|
|
build_match(std::make_shared<eval::Binary_Operator_AST_Node>("+"), prev_stack_top);
|
|
} else {
|
|
m_match_stack.push_back(std::make_shared<eval::Quoted_String_AST_Node>(match, m_filename, prev_line, prev_col, m_line, m_col));
|
|
}
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Reads a character group from input, without skipping initial whitespace
|
|
bool Single_Quoted_String_() {
|
|
bool retval = false;
|
|
if (has_more_input() && (*m_input_pos == '\'')) {
|
|
retval = true;
|
|
char prev_char = *m_input_pos;
|
|
++m_input_pos;
|
|
++m_col;
|
|
|
|
while (has_more_input() && ((*m_input_pos != '\'') || ((*m_input_pos == '\'') && (prev_char == '\\')))) {
|
|
if (!Eol_()) {
|
|
if (prev_char == '\\') {
|
|
prev_char = 0;
|
|
} else {
|
|
prev_char = *m_input_pos;
|
|
}
|
|
++m_input_pos;
|
|
++m_col;
|
|
}
|
|
}
|
|
|
|
if (m_input_pos != m_input_end) {
|
|
++m_input_pos;
|
|
++m_col;
|
|
} else {
|
|
throw exception::eval_error("Unclosed single-quoted string", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
/// Reads (and potentially captures) a char group from input. Translates escaped sequences.
|
|
bool Single_Quoted_String(const bool t_capture = false) {
|
|
SkipWS();
|
|
|
|
if (!t_capture) {
|
|
return Single_Quoted_String_();
|
|
} else {
|
|
const auto start = m_input_pos;
|
|
const auto prev_col = m_col;
|
|
const auto prev_line = m_line;
|
|
if (Single_Quoted_String_()) {
|
|
std::string match;
|
|
bool is_escaped = false;
|
|
for (auto s = start + 1, end = m_input_pos - 1; s != end; ++s) {
|
|
if (*s == '\\') {
|
|
if (is_escaped) {
|
|
match.push_back('\\');
|
|
is_escaped = false;
|
|
} else {
|
|
is_escaped = true;
|
|
}
|
|
} else {
|
|
if (is_escaped) {
|
|
switch (*s) {
|
|
case ('b') : match.push_back('\b'); break;
|
|
case ('f') : match.push_back('\f'); break;
|
|
case ('n') : match.push_back('\n'); break;
|
|
case ('r') : match.push_back('\r'); break;
|
|
case ('t') : match.push_back('\t'); break;
|
|
case ('\'') : match.push_back('\''); break;
|
|
case ('\"') : match.push_back('\"'); break;
|
|
default: throw exception::eval_error("Unknown escaped sequence in string", File_Position(prev_line, prev_col), *m_filename);
|
|
}
|
|
} else {
|
|
match.push_back(*s);
|
|
}
|
|
is_escaped = false;
|
|
}
|
|
}
|
|
m_match_stack.push_back(std::make_shared<eval::Single_Quoted_String_AST_Node>(match, m_filename, prev_line, prev_col, m_line, m_col));
|
|
return true;
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Reads a char from input if it matches the parameter, without skipping initial whitespace
|
|
bool Char_(const char c) {
|
|
if (has_more_input() && (*m_input_pos == c)) {
|
|
++m_input_pos;
|
|
++m_col;
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/// Reads (and potentially captures) a char from input if it matches the parameter
|
|
bool Char(const char t_c, bool t_capture = false) {
|
|
SkipWS();
|
|
|
|
if (!t_capture) {
|
|
return Char_(t_c);
|
|
} else {
|
|
const auto start = m_input_pos;
|
|
const auto prev_col = m_col;
|
|
const auto prev_line = m_line;
|
|
if (Char_(t_c)) {
|
|
std::string match(start, m_input_pos);
|
|
m_match_stack.push_back(std::make_shared<eval::Char_AST_Node>(std::move(match), m_filename, prev_line, prev_col, m_line, m_col));
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Reads a string from input if it matches the parameter, without skipping initial whitespace
|
|
bool Keyword_(const char *t_s) {
|
|
const auto len = strlen(t_s);
|
|
|
|
if ((m_input_end - m_input_pos) >= static_cast<std::make_signed<size_t>::type>(len)) {
|
|
auto tmp = m_input_pos;
|
|
for (size_t i = 0; i < len; ++i) {
|
|
if (*tmp != t_s[i]) {
|
|
return false;
|
|
}
|
|
++tmp;
|
|
}
|
|
m_input_pos = tmp;
|
|
m_col += static_cast<int>(len);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// Reads (and potentially captures) a string from input if it matches the parameter
|
|
bool Keyword(const char *t_s, bool t_capture = false) {
|
|
SkipWS();
|
|
const auto start = m_input_pos;
|
|
const auto prev_col = m_col;
|
|
const auto prev_line = m_line;
|
|
bool retval = Keyword_(t_s);
|
|
// ignore substring matches
|
|
if ( retval && has_more_input() && char_in_alphabet(*m_input_pos, detail::keyword_alphabet) ) {
|
|
m_input_pos = start;
|
|
m_col = prev_col;
|
|
m_line = prev_line;
|
|
retval = false;
|
|
}
|
|
|
|
if ( t_capture && retval ) {
|
|
std::string match(start, m_input_pos);
|
|
m_match_stack.push_back(std::make_shared<eval::Str_AST_Node>(std::move(match), m_filename, prev_line, prev_col, m_line, m_col));
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
/// Reads a symbol group from input if it matches the parameter, without skipping initial whitespace
|
|
bool Symbol_(const char *t_s) {
|
|
const auto len = strlen(t_s);
|
|
|
|
if ((m_input_end - m_input_pos) >= static_cast<std::make_signed<decltype(len)>::type>(len)) {
|
|
auto tmp = m_input_pos;
|
|
for (size_t i = 0; i < len; ++i) {
|
|
if (*tmp != t_s[i]) {
|
|
return false;
|
|
}
|
|
++tmp;
|
|
}
|
|
m_input_pos = tmp;
|
|
m_col += static_cast<int>(len);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// Reads (and potentially captures) a symbol group from input if it matches the parameter
|
|
bool Symbol(const char *t_s, const bool t_capture = false, const bool t_disallow_prevention=false) {
|
|
SkipWS();
|
|
const auto start = m_input_pos;
|
|
const auto prev_col = m_col;
|
|
const auto prev_line = m_line;
|
|
bool retval = Symbol_(t_s);
|
|
|
|
// ignore substring matches
|
|
if (retval && has_more_input() && (t_disallow_prevention == false) && char_in_alphabet(*m_input_pos,detail::symbol_alphabet)) {
|
|
m_input_pos = start;
|
|
m_col = prev_col;
|
|
m_line = prev_line;
|
|
retval = false;
|
|
}
|
|
|
|
if ( t_capture && retval ) {
|
|
std::string match(start, m_input_pos);
|
|
m_match_stack.push_back(std::make_shared<eval::Str_AST_Node>(std::move(match), m_filename, prev_line, prev_col, m_line, m_col));
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Reads an end-of-line group from input, without skipping initial whitespace
|
|
bool Eol_() {
|
|
bool retval = false;
|
|
|
|
if (has_more_input() && (Symbol_("\r\n") || Char_('\n'))) {
|
|
retval = true;
|
|
++m_line;
|
|
m_col = 1;
|
|
} else if (has_more_input() && Char_(';')) {
|
|
retval = true;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Reads (and potentially captures) an end-of-line group from input
|
|
bool Eol(const bool t_capture = false) {
|
|
SkipWS();
|
|
|
|
if (!t_capture) {
|
|
return Eol_();
|
|
} else {
|
|
const auto start = m_input_pos;
|
|
const auto prev_col = m_col;
|
|
const auto prev_line = m_line;
|
|
if (Eol_()) {
|
|
std::string match(start, m_input_pos);
|
|
m_match_stack.push_back(std::make_shared<eval::Eol_AST_Node>(std::move(match), m_filename, prev_line, prev_col, m_line, m_col));
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Reads a comma-separated list of values from input, for function declarations
|
|
bool Decl_Arg_List() {
|
|
SkipWS(true);
|
|
bool retval = false;
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Arg()) {
|
|
retval = true;
|
|
while (Eol()) {}
|
|
if (Char(',')) {
|
|
do {
|
|
while (Eol()) {}
|
|
if (!Arg()) {
|
|
throw exception::eval_error("Unexpected value in parameter list", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
} while (Char(','));
|
|
}
|
|
build_match(std::make_shared<eval::Arg_List_AST_Node>(), prev_stack_top);
|
|
}
|
|
|
|
SkipWS(true);
|
|
|
|
return retval;
|
|
}
|
|
|
|
|
|
/// Reads a comma-separated list of values from input
|
|
bool Arg_List() {
|
|
SkipWS(true);
|
|
bool retval = false;
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Equation()) {
|
|
retval = true;
|
|
while (Eol()) {}
|
|
if (Char(',')) {
|
|
do {
|
|
while (Eol()) {}
|
|
if (!Equation()) {
|
|
throw exception::eval_error("Unexpected value in parameter list", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
} while (Char(','));
|
|
}
|
|
build_match(std::make_shared<eval::Arg_List_AST_Node>(), prev_stack_top);
|
|
}
|
|
|
|
SkipWS(true);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Reads possible special container values, including ranges and map_pairs
|
|
bool Container_Arg_List() {
|
|
bool retval = false;
|
|
SkipWS(true);
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Value_Range()) {
|
|
retval = true;
|
|
build_match(std::make_shared<eval::Arg_List_AST_Node>(), prev_stack_top);
|
|
} else if (Map_Pair()) {
|
|
retval = true;
|
|
while (Eol()) {}
|
|
if (Char(',')) {
|
|
do {
|
|
while (Eol()) {}
|
|
if (!Map_Pair()) {
|
|
throw exception::eval_error("Unexpected value in container", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
} while (Char(','));
|
|
}
|
|
build_match(std::make_shared<eval::Arg_List_AST_Node>(), prev_stack_top);
|
|
} else if (Operator()) {
|
|
retval = true;
|
|
while (Eol()) {}
|
|
if (Char(',')) {
|
|
do {
|
|
while (Eol()) {}
|
|
if (!Operator()) {
|
|
throw exception::eval_error("Unexpected value in container", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
} while (Char(','));
|
|
}
|
|
build_match(std::make_shared<eval::Arg_List_AST_Node>(), prev_stack_top);
|
|
}
|
|
|
|
SkipWS(true);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Reads a lambda (anonymous function) from input
|
|
bool Lambda() {
|
|
bool retval = false;
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Keyword("fun")) {
|
|
retval = true;
|
|
|
|
if (Char('(')) {
|
|
Decl_Arg_List();
|
|
if (!Char(')')) {
|
|
throw exception::eval_error("Incomplete anonymous function", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
}
|
|
|
|
while (Eol()) {}
|
|
|
|
if (!Block()) {
|
|
throw exception::eval_error("Incomplete anonymous function", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Lambda_AST_Node>(), prev_stack_top);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Reads a function definition from input
|
|
bool Def(const bool t_class_context = false) {
|
|
bool retval = false;
|
|
AST_NodePtr annotation;
|
|
|
|
if (Annotation()) {
|
|
while (Eol_()) {}
|
|
annotation = m_match_stack.back();
|
|
m_match_stack.pop_back();
|
|
}
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Keyword("def")) {
|
|
retval = true;
|
|
|
|
if (!Id(true)) {
|
|
throw exception::eval_error("Missing function name in definition", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
bool is_method = false;
|
|
|
|
if (Symbol("::", false)) {
|
|
//We're now a method
|
|
is_method = true;
|
|
|
|
if (!Id(true)) {
|
|
throw exception::eval_error("Missing method name in definition", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
}
|
|
|
|
if (Char('(')) {
|
|
Decl_Arg_List();
|
|
if (!Char(')')) {
|
|
throw exception::eval_error("Incomplete function definition", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
}
|
|
|
|
while (Eol()) {}
|
|
|
|
if (Char(':')) {
|
|
if (!Operator()) {
|
|
throw exception::eval_error("Missing guard expression for function", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
}
|
|
|
|
while (Eol()) {}
|
|
if (!Block()) {
|
|
throw exception::eval_error("Incomplete function definition", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
if (is_method || t_class_context) {
|
|
build_match(std::make_shared<eval::Method_AST_Node>(), prev_stack_top);
|
|
} else {
|
|
build_match(std::make_shared<eval::Def_AST_Node>(), prev_stack_top);
|
|
}
|
|
|
|
if (annotation) {
|
|
m_match_stack.back()->annotation = std::move(annotation);
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Reads a function definition from input
|
|
bool Try() {
|
|
bool retval = false;
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Keyword("try")) {
|
|
retval = true;
|
|
|
|
while (Eol()) {}
|
|
|
|
if (!Block()) {
|
|
throw exception::eval_error("Incomplete 'try' block", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
bool has_matches = true;
|
|
while (has_matches) {
|
|
while (Eol()) {}
|
|
has_matches = false;
|
|
if (Keyword("catch", false)) {
|
|
const auto catch_stack_top = m_match_stack.size();
|
|
if (Char('(')) {
|
|
if (!(Arg() && Char(')'))) {
|
|
throw exception::eval_error("Incomplete 'catch' expression", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
if (Char(':')) {
|
|
if (!Operator()) {
|
|
throw exception::eval_error("Missing guard expression for catch", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
}
|
|
}
|
|
|
|
while (Eol()) {}
|
|
|
|
if (!Block()) {
|
|
throw exception::eval_error("Incomplete 'catch' block", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
build_match(std::make_shared<eval::Catch_AST_Node>(), catch_stack_top);
|
|
has_matches = true;
|
|
}
|
|
}
|
|
while (Eol()) {}
|
|
if (Keyword("finally", false)) {
|
|
const auto finally_stack_top = m_match_stack.size();
|
|
|
|
while (Eol()) {}
|
|
|
|
if (!Block()) {
|
|
throw exception::eval_error("Incomplete 'finally' block", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
build_match(std::make_shared<eval::Finally_AST_Node>(), finally_stack_top);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Try_AST_Node>(), prev_stack_top);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Reads an if/else if/else block from input
|
|
bool If() {
|
|
bool retval = false;
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Keyword("if")) {
|
|
retval = true;
|
|
|
|
if (!Char('(')) {
|
|
throw exception::eval_error("Incomplete 'if' expression", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
if (!(Operator() && Char(')'))) {
|
|
throw exception::eval_error("Incomplete 'if' expression", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
while (Eol()) {}
|
|
|
|
if (!Block()) {
|
|
throw exception::eval_error("Incomplete 'if' block", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
bool has_matches = true;
|
|
while (has_matches) {
|
|
while (Eol()) {}
|
|
has_matches = false;
|
|
if (Keyword("else", true)) {
|
|
if (Keyword("if")) {
|
|
const AST_NodePtr back(m_match_stack.back());
|
|
m_match_stack.back() = std::make_shared<eval::If_AST_Node>("else if");
|
|
m_match_stack.back()->start = back->start;
|
|
m_match_stack.back()->end = back->end;
|
|
m_match_stack.back()->children = back->children;
|
|
m_match_stack.back()->annotation = back->annotation;
|
|
if (!Char('(')) {
|
|
throw exception::eval_error("Incomplete 'else if' expression", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
if (!(Operator() && Char(')'))) {
|
|
throw exception::eval_error("Incomplete 'else if' expression", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
while (Eol()) {}
|
|
|
|
if (!Block()) {
|
|
throw exception::eval_error("Incomplete 'else if' block", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
has_matches = true;
|
|
} else {
|
|
while (Eol()) {}
|
|
|
|
if (!Block()) {
|
|
throw exception::eval_error("Incomplete 'else' block", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
has_matches = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
build_match(std::make_shared<eval::If_AST_Node>(), prev_stack_top);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Reads a class block from input
|
|
bool Class() {
|
|
bool retval = false;
|
|
|
|
size_t prev_stack_top = m_match_stack.size();
|
|
|
|
if (Keyword("class")) {
|
|
retval = true;
|
|
|
|
if (!Id(true)) {
|
|
throw exception::eval_error("Missing class name in definition", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
|
|
while (Eol()) {}
|
|
|
|
if (!Class_Block()) {
|
|
throw exception::eval_error("Incomplete 'class' block", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Class_AST_Node>(), prev_stack_top);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
|
|
/// Reads a while block from input
|
|
bool While() {
|
|
bool retval = false;
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Keyword("while")) {
|
|
retval = true;
|
|
|
|
if (!Char('(')) {
|
|
throw exception::eval_error("Incomplete 'while' expression", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
if (!(Operator() && Char(')'))) {
|
|
throw exception::eval_error("Incomplete 'while' expression", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
while (Eol()) {}
|
|
|
|
if (!Block()) {
|
|
throw exception::eval_error("Incomplete 'while' block", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::While_AST_Node>(), prev_stack_top);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
|
|
/// Reads the C-style for conditions from input
|
|
bool For_Guards() {
|
|
if (!(Equation() && Eol()))
|
|
{
|
|
if (!Eol())
|
|
{
|
|
throw exception::eval_error("'for' loop initial statment missing", File_Position(m_line, m_col), *m_filename);
|
|
} else {
|
|
m_match_stack.push_back(std::make_shared<eval::Noop_AST_Node>());
|
|
}
|
|
}
|
|
|
|
if (!(Equation() && Eol()))
|
|
{
|
|
if (!Eol())
|
|
{
|
|
throw exception::eval_error("'for' loop condition missing", File_Position(m_line, m_col), *m_filename);
|
|
} else {
|
|
m_match_stack.push_back(std::make_shared<eval::Noop_AST_Node>());
|
|
}
|
|
}
|
|
|
|
if (!Equation())
|
|
{
|
|
m_match_stack.push_back(std::make_shared<eval::Noop_AST_Node>());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Reads a for block from input
|
|
*/
|
|
bool For() {
|
|
bool retval = false;
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Keyword("for")) {
|
|
retval = true;
|
|
|
|
if (!Char('(')) {
|
|
throw exception::eval_error("Incomplete 'for' expression", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
if (!(For_Guards() && Char(')'))) {
|
|
throw exception::eval_error("Incomplete 'for' expression", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
while (Eol()) {}
|
|
|
|
if (!Block()) {
|
|
throw exception::eval_error("Incomplete 'for' block", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::For_AST_Node>(), prev_stack_top);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Reads a case block from input
|
|
bool Case() {
|
|
bool retval = false;
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Keyword("case")) {
|
|
retval = true;
|
|
|
|
if (!Char('(')) {
|
|
throw exception::eval_error("Incomplete 'case' expression", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
if (!(Operator() && Char(')'))) {
|
|
throw exception::eval_error("Incomplete 'case' expression", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
while (Eol()) {}
|
|
|
|
if (!Block()) {
|
|
throw exception::eval_error("Incomplete 'case' block", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Case_AST_Node>(), prev_stack_top);
|
|
} else if (Keyword("default")) {
|
|
while (Eol()) {}
|
|
|
|
if (!Block()) {
|
|
throw exception::eval_error("Incomplete 'default' block", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Default_AST_Node>(), prev_stack_top);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
|
|
/// Reads a switch statement from input
|
|
bool Switch() {
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Keyword("switch")) {
|
|
|
|
if (!Char('(')) {
|
|
throw exception::eval_error("Incomplete 'switch' expression", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
if (!(Operator() && Char(')'))) {
|
|
throw exception::eval_error("Incomplete 'switch' expression", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
while (Eol()) {}
|
|
|
|
if (Char('{')) {
|
|
while (Eol()) {}
|
|
|
|
while (Case()) {
|
|
while (Eol()) { } // eat
|
|
}
|
|
|
|
while (Eol()) { } // eat
|
|
|
|
if (!Char('}')) {
|
|
throw exception::eval_error("Incomplete block", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
}
|
|
else {
|
|
throw exception::eval_error("Incomplete block", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Switch_AST_Node>(), prev_stack_top);
|
|
return true;
|
|
|
|
} else {
|
|
return false;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
/// Reads a curly-brace C-style class block from input
|
|
bool Class_Block() {
|
|
bool retval = false;
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Char('{')) {
|
|
retval = true;
|
|
|
|
Class_Statements();
|
|
if (!Char('}')) {
|
|
throw exception::eval_error("Incomplete class block", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Block_AST_Node>(), prev_stack_top);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Reads a curly-brace C-style block from input
|
|
bool Block() {
|
|
bool retval = false;
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Char('{')) {
|
|
retval = true;
|
|
|
|
Statements();
|
|
if (!Char('}')) {
|
|
throw exception::eval_error("Incomplete block", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Block_AST_Node>(), prev_stack_top);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Reads a return statement from input
|
|
bool Return() {
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Keyword("return")) {
|
|
Operator();
|
|
build_match(std::make_shared<eval::Return_AST_Node>(), prev_stack_top);
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/// Reads a break statement from input
|
|
bool Break() {
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Keyword("break")) {
|
|
build_match(std::make_shared<eval::Break_AST_Node>(), prev_stack_top);
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/// Reads a continue statement from input
|
|
bool Continue() {
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Keyword("continue")) {
|
|
build_match(std::make_shared<eval::Continue_AST_Node>(), prev_stack_top);
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/// Reads a dot expression(member access), then proceeds to check if it's a function or array call
|
|
bool Dot_Fun_Array() {
|
|
bool retval = false;
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
if (Lambda() || Num(true) || Quoted_String(true) || Single_Quoted_String(true) ||
|
|
Paren_Expression() || Inline_Container() || Id(true))
|
|
{
|
|
retval = true;
|
|
bool has_more = true;
|
|
|
|
while (has_more) {
|
|
has_more = false;
|
|
|
|
if (Char('(')) {
|
|
has_more = true;
|
|
|
|
Arg_List();
|
|
if (!Char(')')) {
|
|
throw exception::eval_error("Incomplete function call", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Fun_Call_AST_Node>(), prev_stack_top);
|
|
/// \todo Work around for method calls until we have a better solution
|
|
if (!m_match_stack.back()->children.empty()) {
|
|
if (m_match_stack.back()->children[0]->identifier == AST_Node_Type::Dot_Access) {
|
|
AST_NodePtr dot_access = m_match_stack.back()->children[0];
|
|
AST_NodePtr func_call = m_match_stack.back();
|
|
m_match_stack.pop_back();
|
|
func_call->children.erase(func_call->children.begin());
|
|
func_call->children.insert(func_call->children.begin(), dot_access->children.back());
|
|
dot_access->children.pop_back();
|
|
dot_access->children.push_back(std::move(func_call));
|
|
m_match_stack.push_back(std::move(dot_access));
|
|
}
|
|
}
|
|
} else if (Char('[')) {
|
|
has_more = true;
|
|
|
|
if (!(Operator() && Char(']'))) {
|
|
throw exception::eval_error("Incomplete array access", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Array_Call_AST_Node>(), prev_stack_top);
|
|
}
|
|
else if (Symbol(".", true)) {
|
|
has_more = true;
|
|
if (!(Id(true))) {
|
|
throw exception::eval_error("Incomplete array access", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Dot_Access_AST_Node>(), prev_stack_top);
|
|
}
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Reads a variable declaration from input
|
|
bool Var_Decl(const bool t_class_context = false) {
|
|
bool retval = false;
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (t_class_context && (Keyword("attr") || Keyword("auto") || Keyword("var"))) {
|
|
retval = true;
|
|
|
|
if (!Id(true)) {
|
|
throw exception::eval_error("Incomplete attribute declaration", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Attr_Decl_AST_Node>(), prev_stack_top);
|
|
} else if (Keyword("auto") || Keyword("var")) {
|
|
retval = true;
|
|
|
|
if (!(Reference() || Id(true))) {
|
|
throw exception::eval_error("Incomplete variable declaration", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Var_Decl_AST_Node>(), prev_stack_top);
|
|
} else if (Keyword("attr")) {
|
|
retval = true;
|
|
|
|
if (!Id(true)) {
|
|
throw exception::eval_error("Incomplete attribute declaration", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
if (!Symbol("::", false)) {
|
|
throw exception::eval_error("Incomplete attribute declaration", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
if (!Id(true)) {
|
|
throw exception::eval_error("Missing attribute name in definition", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
|
|
build_match(std::make_shared<eval::Attr_Decl_AST_Node>(), prev_stack_top);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Reads an expression surrounded by parentheses from input
|
|
bool Paren_Expression() {
|
|
if (Char('(')) {
|
|
if (!Operator()) {
|
|
throw exception::eval_error("Incomplete expression", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
if (!Char(')')) {
|
|
throw exception::eval_error("Missing closing parenthesis ')'", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/// Reads, and identifies, a short-form container initialization from input
|
|
bool Inline_Container() {
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Char('[')) {
|
|
Container_Arg_List();
|
|
|
|
if (!Char(']')) {
|
|
throw exception::eval_error("Missing closing square bracket ']' in container initializer", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
if ((prev_stack_top != m_match_stack.size()) && (m_match_stack.back()->children.size() > 0)) {
|
|
if (m_match_stack.back()->children[0]->identifier == AST_Node_Type::Value_Range) {
|
|
build_match(std::make_shared<eval::Inline_Range_AST_Node>(), prev_stack_top);
|
|
}
|
|
else if (m_match_stack.back()->children[0]->identifier == AST_Node_Type::Map_Pair) {
|
|
build_match(std::make_shared<eval::Inline_Map_AST_Node>(), prev_stack_top);
|
|
}
|
|
else {
|
|
build_match(std::make_shared<eval::Inline_Array_AST_Node>(), prev_stack_top);
|
|
}
|
|
}
|
|
else {
|
|
build_match(std::make_shared<eval::Inline_Array_AST_Node>(), prev_stack_top);
|
|
}
|
|
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/// Parses a variable specified with a & aka reference
|
|
bool Reference() {
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Symbol("&", false)) {
|
|
if (!Id(true)) {
|
|
throw exception::eval_error("Incomplete '&' expression", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Reference_AST_Node>(), prev_stack_top);
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/// Reads a unary prefixed expression from input
|
|
bool Prefix() {
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
const std::vector<std::string> prefix_opers{"++", "--", "-", "+", "!", "~", "&"};
|
|
|
|
for (const auto &oper : prefix_opers)
|
|
{
|
|
bool is_char = oper.size() == 1;
|
|
if ((is_char && Char(oper[0], true)) || (!is_char && Symbol(oper.c_str(), true)))
|
|
{
|
|
if (!Operator(m_operators.size()-1)) {
|
|
throw exception::eval_error("Incomplete prefix '" + oper + "' expression", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Prefix_AST_Node>(Operators::to_operator(oper, true)), prev_stack_top);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// Parses any of a group of 'value' style ast_node groups from input
|
|
bool Value() {
|
|
if (Var_Decl() || Dot_Fun_Array() || Prefix()) {
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool Operator_Helper(const size_t t_precedence) {
|
|
for (auto & elem : m_operator_matches[t_precedence]) {
|
|
if (Symbol(elem.c_str(), true)) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool Operator(const size_t t_precedence = 0) {
|
|
bool retval = false;
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (t_precedence < m_operators.size()) {
|
|
if (Operator(t_precedence+1)) {
|
|
retval = true;
|
|
if (Operator_Helper(t_precedence)) {
|
|
do {
|
|
while (Eol()) {}
|
|
if (!Operator(t_precedence+1)) {
|
|
throw exception::eval_error("Incomplete "
|
|
+ std::string(ast_node_type_to_string(m_operators[t_precedence])) + " expression",
|
|
File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
AST_NodePtr oper = m_match_stack.at(m_match_stack.size()-2);
|
|
|
|
switch (m_operators[t_precedence]) {
|
|
case(AST_Node_Type::Ternary_Cond) :
|
|
m_match_stack.erase(m_match_stack.begin() + m_match_stack.size() - 2,
|
|
m_match_stack.begin() + m_match_stack.size() - 1);
|
|
if (Symbol(":")) {
|
|
if (!Operator(t_precedence+1)) {
|
|
throw exception::eval_error("Incomplete "
|
|
+ std::string(ast_node_type_to_string(m_operators[t_precedence])) + " expression",
|
|
File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
build_match(std::make_shared<eval::Ternary_Cond_AST_Node>(), prev_stack_top);
|
|
}
|
|
else {
|
|
throw exception::eval_error("Incomplete "
|
|
+ std::string(ast_node_type_to_string(m_operators[t_precedence])) + " expression",
|
|
File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
break;
|
|
|
|
case(AST_Node_Type::Addition) :
|
|
case(AST_Node_Type::Multiplication) :
|
|
case(AST_Node_Type::Shift) :
|
|
case(AST_Node_Type::Equality) :
|
|
case(AST_Node_Type::Bitwise_And) :
|
|
case(AST_Node_Type::Bitwise_Xor) :
|
|
case(AST_Node_Type::Bitwise_Or) :
|
|
case(AST_Node_Type::Comparison) :
|
|
assert(m_match_stack.size() > 1);
|
|
m_match_stack.erase(m_match_stack.begin() + m_match_stack.size() - 2, m_match_stack.begin() + m_match_stack.size() - 1);
|
|
build_match(std::make_shared<eval::Binary_Operator_AST_Node>(oper->text), prev_stack_top);
|
|
break;
|
|
|
|
case(AST_Node_Type::Logical_And) :
|
|
build_match(std::make_shared<eval::Logical_And_AST_Node>(), prev_stack_top);
|
|
break;
|
|
case(AST_Node_Type::Logical_Or) :
|
|
build_match(std::make_shared<eval::Logical_Or_AST_Node>(), prev_stack_top);
|
|
break;
|
|
|
|
default:
|
|
throw exception::eval_error("Internal error: unhandled ast_node", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
} while (Operator_Helper(t_precedence));
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
return Value();
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Reads a pair of values used to create a map initialization from input
|
|
bool Map_Pair() {
|
|
bool retval = false;
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
const auto prev_pos = m_input_pos;
|
|
const auto prev_col = m_col;
|
|
|
|
if (Operator()) {
|
|
if (Symbol(":")) {
|
|
retval = true;
|
|
if (!Operator()) {
|
|
throw exception::eval_error("Incomplete map pair", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Map_Pair_AST_Node>(), prev_stack_top);
|
|
}
|
|
else {
|
|
m_input_pos = prev_pos;
|
|
m_col = prev_col;
|
|
while (prev_stack_top != m_match_stack.size()) {
|
|
m_match_stack.pop_back();
|
|
}
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Reads a pair of values used to create a range initialization from input
|
|
bool Value_Range() {
|
|
bool retval = false;
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
const auto prev_pos = m_input_pos;
|
|
const auto prev_col = m_col;
|
|
|
|
if (Operator()) {
|
|
if (Symbol("..")) {
|
|
retval = true;
|
|
if (!Operator()) {
|
|
throw exception::eval_error("Incomplete value range", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Value_Range_AST_Node>(), prev_stack_top);
|
|
}
|
|
else {
|
|
m_input_pos = prev_pos;
|
|
m_col = prev_col;
|
|
while (prev_stack_top != m_match_stack.size()) {
|
|
m_match_stack.pop_back();
|
|
}
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Parses a string of binary equation operators
|
|
bool Equation() {
|
|
bool retval = false;
|
|
|
|
const auto prev_stack_top = m_match_stack.size();
|
|
|
|
if (Operator()) {
|
|
retval = true;
|
|
if (Symbol("=", true, true) || Symbol(":=", true, true) || Symbol("+=", true, true) ||
|
|
Symbol("-=", true, true) || Symbol("*=", true, true) || Symbol("/=", true, true) ||
|
|
Symbol("%=", true, true) || Symbol("<<=", true, true) || Symbol(">>=", true, true) ||
|
|
Symbol("&=", true, true) || Symbol("^=", true, true) || Symbol("|=", true, true)) {
|
|
SkipWS(true);
|
|
if (!Equation()) {
|
|
throw exception::eval_error("Incomplete equation", File_Position(m_line, m_col), *m_filename);
|
|
}
|
|
|
|
build_match(std::make_shared<eval::Equation_AST_Node>(), prev_stack_top);
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Parses statements allowed inside of a class block
|
|
bool Class_Statements() {
|
|
bool retval = false;
|
|
|
|
bool has_more = true;
|
|
bool saw_eol = true;
|
|
|
|
while (has_more) {
|
|
const auto prev_line = m_line;
|
|
const auto prev_col = m_col;
|
|
if (Def(true) || Var_Decl(true)) {
|
|
if (!saw_eol) {
|
|
throw exception::eval_error("Two function definitions missing line separator", File_Position(prev_line, prev_col), *m_filename);
|
|
}
|
|
has_more = true;
|
|
retval = true;
|
|
saw_eol = true;
|
|
} else if (Eol()) {
|
|
has_more = true;
|
|
retval = true;
|
|
saw_eol = true;
|
|
} else {
|
|
has_more = false;
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Top level parser, starts parsing of all known parses
|
|
bool Statements() {
|
|
bool retval = false;
|
|
|
|
bool has_more = true;
|
|
bool saw_eol = true;
|
|
|
|
while (has_more) {
|
|
int prev_line = m_line;
|
|
int prev_col = m_col;
|
|
if (Def() || Try() || If() || While() || Class() || For() || Switch()) {
|
|
if (!saw_eol) {
|
|
throw exception::eval_error("Two function definitions missing line separator", File_Position(prev_line, prev_col), *m_filename);
|
|
}
|
|
has_more = true;
|
|
retval = true;
|
|
saw_eol = true;
|
|
}
|
|
else if (Return() || Break() || Continue() || Equation()) {
|
|
if (!saw_eol) {
|
|
throw exception::eval_error("Two expressions missing line separator", File_Position(prev_line, prev_col), *m_filename);
|
|
}
|
|
has_more = true;
|
|
retval = true;
|
|
saw_eol = false;
|
|
}
|
|
else if (Block() || Eol()) {
|
|
has_more = true;
|
|
retval = true;
|
|
saw_eol = true;
|
|
}
|
|
else {
|
|
has_more = false;
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/// Parses the given input string, tagging parsed ast_nodes with the given m_filename.
|
|
bool parse(const std::string &t_input, std::string t_fname) {
|
|
m_input_pos = t_input.begin();
|
|
m_input_end = t_input.end();
|
|
m_line = 1;
|
|
m_col = 1;
|
|
m_filename = std::make_shared<std::string>(std::move(t_fname));
|
|
|
|
if ((t_input.size() > 1) && (t_input[0] == '#') && (t_input[1] == '!')) {
|
|
while ((m_input_pos != m_input_end) && (!Eol())) {
|
|
++m_input_pos;
|
|
}
|
|
/// \todo respect // -*- coding: utf-8 -*- on line 1 or 2 see: http://evanjones.ca/python-utf8.html)
|
|
}
|
|
|
|
if (Statements()) {
|
|
if (m_input_pos != m_input_end) {
|
|
throw exception::eval_error("Unparsed input", File_Position(m_line, m_col), t_fname);
|
|
} else {
|
|
build_match(std::make_shared<eval::File_AST_Node>(), 0);
|
|
return true;
|
|
}
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
};
|
|
}
|
|
}
|
|
|
|
#endif /* CHAISCRIPT_PARSER_HPP_ */
|
|
|