1197 lines
41 KiB
C++
1197 lines
41 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, Jonathan Turner (jturner@minnow-lang.org)
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// and Jason Turner (lefticus@gmail.com)
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// http://www.chaiscript.com
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#ifndef CHAISCRIPT_EVAL_HPP_
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#define CHAISCRIPT_EVAL_HPP_
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#include <map>
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namespace chaiscript
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{
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/**
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* Helper function that will set up the scope around a function call, including handling the named function parameters
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*/
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template <typename Eval_System>
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const Boxed_Value eval_function (Eval_System &ss, const TokenPtr &node, const std::vector<std::string> ¶m_names, const std::vector<Boxed_Value> &vals) {
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ss.new_scope();
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for (unsigned int i = 0; i < param_names.size(); ++i) {
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ss.add_object(param_names[i], vals[i]);
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}
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try {
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Boxed_Value retval(eval_token(ss, node));
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ss.pop_scope();
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return retval;
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} catch (const Return_Value &rv) {
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ss.pop_scope();
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return rv.retval;
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} catch (...) {
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ss.pop_scope();
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throw;
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}
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}
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/**
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* Evaluates the top-level file node
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*/
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template <typename Eval_System>
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Boxed_Value eval_file(Eval_System &ss, const TokenPtr &node) {
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Boxed_Value retval;
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unsigned int i;
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for (i = 0; i < node->children.size(); ++i) {
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retval = eval_token(ss, node->children[i]);
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}
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return retval;
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}
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template <typename Eval_System>
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void cache_const(Eval_System &/*ss*/, const TokenPtr &node, const Boxed_Value &value) {
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node->cached_value = value;
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node->is_cached = true;
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}
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/**
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* Evaluates a variable or function name identifier
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*/
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template <typename Eval_System>
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Boxed_Value eval_id(Eval_System &ss, const TokenPtr &node) {
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if (node->text == "true") {
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//return const_var(true);
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if (!node->is_cached) {
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cache_const(ss, node, const_var(true));
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}
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return node->cached_value;
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}
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else if (node->text == "false") {
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//return const_var(false);
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if (!node->is_cached) {
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cache_const(ss, node, const_var(false));
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}
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return node->cached_value;
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}
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else {
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try {
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return ss.get_object(node->text);
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}
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catch (std::exception &) {
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throw Eval_Error("Can not find object: " + node->text, node);
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}
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}
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}
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/**
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* Evaluates a floating point number
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*/
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template <typename Eval_System>
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Boxed_Value eval_float(Eval_System &ss, const TokenPtr &node) {
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//return const_var(double(atof(node->text.c_str())));
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if (!node->is_cached) {
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cache_const(ss, node, const_var(double(atof(node->text.c_str()))));
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}
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return node->cached_value;
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}
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/**
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* Evaluates an integer
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*/
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template <typename Eval_System>
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Boxed_Value eval_int(Eval_System &ss, const TokenPtr &node) {
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//return const_var(atoi(node->text.c_str()));
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if (!node->is_cached) {
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cache_const(ss, node, const_var(int(atoi(node->text.c_str()))));
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}
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return node->cached_value;
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}
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/**
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* Evaluates a quoted string
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*/
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template <typename Eval_System>
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Boxed_Value eval_quoted_string(Eval_System &ss, const TokenPtr &node) {
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//return const_var(node->text);
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/*
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if ((node->text.size() > 0) && (node->text[0] == '$')) {
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node->text.erase(0, 1);
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Param_List_Builder plb;
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plb << node->text;
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return ss.call_function("eval", plb);
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}
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*/
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if (!node->is_cached) {
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cache_const(ss, node, const_var(node->text));
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}
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return node->cached_value;
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}
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/**
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* Evaluates a char group
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*/
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template <typename Eval_System>
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Boxed_Value eval_single_quoted_string(Eval_System &ss, const TokenPtr &node) {
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/*
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if (node->text.size() == 1) {
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//return Boxed_Value(char(node->text[0]));
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return const_var(char(node->text[0]));
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}
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else {
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//return Boxed_Value(char((int)node->text[0] * 0xff + (int)node->text[0]));
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return const_var(char((int)node->text[0] * 0xff + (int)node->text[0]));
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}
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*/
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if (!node->is_cached) {
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cache_const(ss, node,
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node->text.size() == 1 ?
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const_var(char(node->text[0])) :
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const_var(char((int)node->text[0] * 0xff + (int)node->text[0])));
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}
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return node->cached_value;
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}
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/**
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* Evaluates a string of equations in reverse order so that the right-most side has precedence
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*/
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template <typename Eval_System>
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Boxed_Value eval_equation(Eval_System &ss, const TokenPtr &node) {
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unsigned int i;
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Boxed_Value retval = eval_token(ss, node->children.back());
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if (node->children.size() > 1) {
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for (i = node->children.size()-3; ((int)i) >= 0; i -= 2) {
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if (node->children[i+1]->text == "=") {
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Boxed_Value lhs = eval_token(ss, node->children[i]);
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try {
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if (lhs.is_unknown())
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{
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retval = ss.call_function("clone", Param_List_Builder() << retval);
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}
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Param_List_Builder plb;
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plb << lhs;
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plb << retval;
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try {
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retval = ss.call_function(node->children[i+1]->text, plb);
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}
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catch(const dispatch_error &){
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throw Eval_Error("Mismatched types in equation", node->children[i+1]);
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}
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}
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catch(const dispatch_error &){
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throw Eval_Error("Can not clone right hand side of equation", node->children[i+1]);
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}
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}
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else if (node->children[i+1]->text == ":=") {
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Boxed_Value lhs = eval_token(ss, node->children[i]);
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if (lhs.is_unknown() || type_match(lhs, retval)) {
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lhs.assign(retval);
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}
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else {
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throw Eval_Error("Mismatched types in equation", node->children[i+1]);
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}
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}
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else {
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Param_List_Builder plb;
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plb << eval_token(ss, node->children[i]);
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plb << retval;
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try {
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retval = ss.call_function(node->children[i+1]->text, plb);
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}
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catch(const dispatch_error &){
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throw Eval_Error("Can not find appropriate '" + node->children[i+1]->text + "'", node->children[i+1]);
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}
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}
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}
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}
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return retval;
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}
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/**
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* Evaluates a variable declaration
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*/
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template <typename Eval_System>
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Boxed_Value eval_var_decl(Eval_System &ss, const TokenPtr &node) {
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try {
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ss.add_object(node->children[0]->text, Boxed_Value());
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}
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catch (reserved_word_error &) {
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throw Eval_Error("Reserved word used as variable '" + node->children[0]->text + "'", node);
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}
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return ss.get_object(node->children[0]->text);
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}
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/**
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* Evaluates an attribute declaration
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*/
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template <typename Eval_System>
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Boxed_Value eval_attr_decl(Eval_System &ss, const TokenPtr &node) {
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try {
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ss.add(fun(boost::function<Boxed_Value (Dynamic_Object &)>(boost::bind(&dynamic_object_attribute, node->children[0]->text,
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node->children[1]->text, _1))), node->children[1]->text);
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}
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catch (reserved_word_error &) {
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throw Eval_Error("Reserved word used as attribute '" + node->children[1]->text + "'", node);
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}
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return Boxed_Value();
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}
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/**
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* Evaluates binary boolean operators. Respects short-circuiting rules.
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*/
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template <typename Eval_System>
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Boxed_Value eval_expression(Eval_System &ss, const TokenPtr &node) {
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unsigned int i;
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Boxed_Value retval = eval_token(ss, node->children[0]);
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if (node->children.size() > 1) {
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for (i = 1; i < node->children.size(); i += 2) {
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bool lhs;
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try {
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lhs = boxed_cast<bool &>(retval);
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}
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catch (const bad_boxed_cast &) {
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throw Eval_Error("Condition not boolean", node);
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}
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if (node->children[i]->text == "&&") {
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if (lhs) {
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retval = eval_token(ss, node->children[i+1]);
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}
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else {
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retval = Boxed_Value(false);
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}
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}
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else if (node->children[i]->text == "||") {
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if (lhs) {
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retval = Boxed_Value(true);
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}
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else {
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retval = eval_token(ss, node->children[i+1]);
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}
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}
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}
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}
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return retval;
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}
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/**
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* Evaluates comparison, additions, and multiplications and their relatives
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*/
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template <typename Eval_System>
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Boxed_Value eval_comp_add_mul(Eval_System &ss, const TokenPtr &node) {
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unsigned int i;
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Boxed_Value retval = eval_token(ss, node->children[0]);
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if (node->children.size() > 1) {
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for (i = 1; i < node->children.size(); i += 2) {
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Param_List_Builder plb;
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plb << retval;
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plb << eval_token(ss, node->children[i + 1]);
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try {
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retval = ss.call_function(node->children[i]->text, plb);
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}
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catch(const dispatch_error &){
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throw Eval_Error("Can not find appropriate '" + node->children[i]->text + "'", node->children[i]);
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}
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}
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}
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return retval;
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}
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/**
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* Evaluates an array lookup
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*/
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template <typename Eval_System>
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Boxed_Value eval_array_call(Eval_System &ss, const TokenPtr &node) {
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unsigned int i;
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Boxed_Value retval = eval_token(ss, node->children[0]);
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for (i = 1; i < node->children.size(); ++i) {
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Param_List_Builder plb;
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plb << retval;
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plb << eval_token(ss, node->children[i]);
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try {
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retval = ss.call_function("[]", plb);
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}
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catch(std::out_of_range &) {
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throw Eval_Error("Out of bounds exception", node);
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}
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catch(const dispatch_error &){
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throw Eval_Error("Can not find appropriate array lookup '[]' " + node->children[i]->text, node->children[i]);
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}
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}
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return retval;
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}
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/**
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* Evaluates a unary negation
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*/
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template <typename Eval_System>
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Boxed_Value eval_negate(Eval_System &ss, const TokenPtr &node) {
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Boxed_Value retval = eval_token(ss, node->children[0]);
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Param_List_Builder plb;
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plb << retval;
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plb << Boxed_Value(-1.0);
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try {
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return ss.call_function("*", plb);
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}
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catch(std::exception &){
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throw Eval_Error("Can not find appropriate negation", node->children[0]);
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}
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}
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/**
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* Evaluates a unary boolean not
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*/
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template <typename Eval_System>
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Boxed_Value eval_not(Eval_System &ss, const TokenPtr &node) {
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try {
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return Boxed_Value(!boxed_cast<bool>(eval_token(ss, node->children[0])));
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}
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catch (const bad_boxed_cast &) {
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throw Eval_Error("Boolean not('!') condition not boolean", node->children[0]);
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}
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}
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/**
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* Evaluates any unary prefix
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*/
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template <typename Eval_System>
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Boxed_Value eval_prefix(Eval_System &ss, const TokenPtr &node) {
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Param_List_Builder plb;
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plb << eval_token(ss, node->children[1]);
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try {
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return ss.call_function(node->children[0]->text, plb);
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}
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catch(std::exception &){
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throw Eval_Error("Can not find appropriate prefix", node->children[0]);
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}
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}
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/**
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* Evaluates (and generates) an inline array initialization
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*/
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template <typename Eval_System>
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Boxed_Value eval_inline_array(Eval_System &ss, const TokenPtr &node) {
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unsigned int i;
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try {
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Boxed_Value retval = ss.call_function("Vector", Param_List_Builder());
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if (node->children.size() > 0) {
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for (i = 0; i < node->children[0]->children.size(); ++i) {
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try {
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Boxed_Value tmp = eval_token(ss, node->children[0]->children[i]);
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ss.call_function("push_back", Param_List_Builder() << retval << tmp);
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}
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catch (const dispatch_error &) {
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throw Eval_Error("Can not find appropriate 'push_back'", node->children[0]->children[i]);
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}
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}
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}
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return retval;
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}
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catch (const dispatch_error &) {
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throw Eval_Error("Can not find appropriate 'Vector()'", node);
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}
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}
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/**
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* Evaluates (and generates) an inline range initialization
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*/
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template <typename Eval_System>
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Boxed_Value eval_inline_range(Eval_System &ss, const TokenPtr &node) {
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try {
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return ss.call_function("generate_range", Param_List_Builder()
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<< eval_token(ss, node->children[0]->children[0]->children[0])
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<< eval_token(ss, node->children[0]->children[0]->children[1]));
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}
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catch (const dispatch_error &) {
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throw Eval_Error("Unable to generate range vector", node);
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}
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}
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/**
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* Evaluates (and generates) an inline map initialization
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*/
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template <typename Eval_System>
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Boxed_Value eval_inline_map(Eval_System &ss, const TokenPtr &node) {
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unsigned int i;
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try {
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Boxed_Value retval = ss.call_function("Map", Param_List_Builder());
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for (i = 0; i < node->children[0]->children.size(); ++i) {
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try {
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Boxed_Value key = eval_token(ss, node->children[0]->children[i]->children[0]);
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Boxed_Value slot = ss.call_function("[]", Param_List_Builder() << retval << key);
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ss.call_function("=", Param_List_Builder() << slot << eval_token(ss, node->children[0]->children[i]->children[1]));
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}
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catch (const dispatch_error &) {
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throw Eval_Error("Can not find appropriate '=' for map init", node->children[0]->children[i]);
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}
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}
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return retval;
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}
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catch (const dispatch_error &) {
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throw Eval_Error("Can not find appropriate 'Map()'", node);
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}
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}
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/**
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* Evaluates a function call, starting with its arguments. Handles resetting the scope to the previous one after the call.
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*/
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template <typename Eval_System>
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Boxed_Value eval_fun_call(Eval_System &ss, const TokenPtr &node) {
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Param_List_Builder plb;
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Dispatch_Engine::Stack prev_stack = ss.get_stack();
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Dispatch_Engine::Stack new_stack = ss.new_stack();
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unsigned int i;
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if ((node->children.size() > 1) && (node->children[1]->identifier == Token_Type::Arg_List)) {
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for (i = 0; i < node->children[1]->children.size(); ++i) {
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plb << eval_token(ss, node->children[1]->children[i]);
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}
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}
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try {
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Boxed_Value fn = eval_token(ss, node->children[0]);
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try {
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ss.set_stack(new_stack);
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Boxed_Value retval = (*boxed_cast<Const_Proxy_Function>(fn))(plb);
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ss.set_stack(prev_stack);
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return retval;
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}
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catch(const dispatch_error &e){
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ss.set_stack(prev_stack);
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throw Eval_Error(std::string(e.what()) + " with function '" + node->children[0]->text + "'", node->children[0]);
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}
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catch(Return_Value &rv) {
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ss.set_stack(prev_stack);
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return rv.retval;
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}
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catch(...) {
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ss.set_stack(prev_stack);
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throw;
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}
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}
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catch(Eval_Error &ee) {
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ss.set_stack(prev_stack);
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throw Eval_Error(ee.reason, node->children[0]);
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}
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}
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/**
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* Evaluates a function call, starting with its arguments. Does NOT change scope.
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*/
|
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template <typename Eval_System>
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Boxed_Value eval_inplace_fun_call(Eval_System &ss, const TokenPtr &node) {
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Param_List_Builder plb;
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unsigned int i;
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|
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if ((node->children.size() > 1) && (node->children[1]->identifier == Token_Type::Arg_List)) {
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for (i = 0; i < node->children[1]->children.size(); ++i) {
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plb << eval_token(ss, node->children[1]->children[i]);
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}
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}
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try {
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Boxed_Value fn = eval_token(ss, node->children[0]);
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try {
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Boxed_Value retval = (*boxed_cast<Const_Proxy_Function >(fn))(plb);
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return retval;
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}
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catch(const dispatch_error &e){
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throw Eval_Error(std::string(e.what()) + " with function '" + node->children[0]->text + "'", node->children[0]);
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}
|
|
catch(Return_Value &rv) {
|
|
return rv.retval;
|
|
}
|
|
catch(...) {
|
|
throw;
|
|
}
|
|
}
|
|
catch(Eval_Error &ee) {
|
|
throw Eval_Error(ee.reason, node->children[0]);
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Evaluates a method/attributes invocation
|
|
*/
|
|
template <typename Eval_System>
|
|
Boxed_Value eval_dot_access(Eval_System &ss, const TokenPtr &node) {
|
|
std::vector<std::pair<std::string, Proxy_Function > > fn;
|
|
Dispatch_Engine::Stack prev_stack = ss.get_stack();
|
|
Dispatch_Engine::Stack new_stack = ss.new_stack();
|
|
unsigned int i, j;
|
|
|
|
//todo: Please extract a single way of doing function calls between this and eval_fun_call
|
|
|
|
Boxed_Value retval = eval_token(ss, node->children[0]);
|
|
if (node->children.size() > 1) {
|
|
for (i = 1; i < node->children.size(); ++i) {
|
|
Param_List_Builder plb;
|
|
plb << retval;
|
|
|
|
if (node->children[i]->children.size() > 1) {
|
|
for (j = 0; j < node->children[i]->children[1]->children.size(); ++j) {
|
|
plb << eval_token(ss, node->children[i]->children[1]->children[j]);
|
|
}
|
|
}
|
|
|
|
//std::string fun_name;
|
|
Boxed_Value fn;
|
|
try {
|
|
if (node->children[i]->identifier == Token_Type::Fun_Call) {
|
|
//fun_name = node->children[i]->children[0]->text;
|
|
fn = eval_token(ss, node->children[i]->children[0]);
|
|
}
|
|
else {
|
|
//fun_name = node->children[i]->text;
|
|
fn = eval_token(ss, node->children[i]);
|
|
}
|
|
}
|
|
catch(Eval_Error &ee) {
|
|
ss.set_stack(prev_stack);
|
|
throw Eval_Error(ee.reason, node->children[i]);
|
|
}
|
|
try {
|
|
//fn = ss.get_function(fun_name);
|
|
ss.set_stack(new_stack);
|
|
//retval = dispatch(fn, plb);
|
|
retval = (*boxed_cast<Const_Proxy_Function >(fn))(plb);
|
|
ss.set_stack(prev_stack);
|
|
}
|
|
catch(const dispatch_error &e){
|
|
ss.set_stack(prev_stack);
|
|
throw Eval_Error(std::string(e.what()), node->children[i]);
|
|
}
|
|
catch(Return_Value &rv) {
|
|
ss.set_stack(prev_stack);
|
|
retval = rv.retval;
|
|
}
|
|
catch(...) {
|
|
ss.set_stack(prev_stack);
|
|
throw;
|
|
}
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* Evaluates an if/elseif/else block
|
|
*/
|
|
template <typename Eval_System>
|
|
Boxed_Value eval_try(Eval_System &ss, const TokenPtr &node) {
|
|
Boxed_Value retval;
|
|
retval = Boxed_Value();
|
|
|
|
ss.new_scope();
|
|
try {
|
|
retval = eval_token(ss, node->children[0]);
|
|
}
|
|
catch (const Eval_Error &) {
|
|
if (node->children.back()->identifier == Token_Type::Finally) {
|
|
eval_token(ss, node->children.back()->children[0]);
|
|
}
|
|
ss.pop_scope();
|
|
throw;
|
|
}
|
|
catch (const std::exception &e) {
|
|
Boxed_Value except = Boxed_Value(boost::ref(e));
|
|
|
|
unsigned int end_point = node->children.size();
|
|
if (node->children.back()->identifier == Token_Type::Finally) {
|
|
end_point = node->children.size() - 1;
|
|
}
|
|
for (unsigned int i = 1; i < end_point; ++i) {
|
|
TokenPtr catch_block = node->children[i];
|
|
|
|
if (catch_block->children.size() == 1) {
|
|
//No variable capture, no guards
|
|
retval = eval_token(ss, catch_block->children[0]);
|
|
break;
|
|
}
|
|
else if (catch_block->children.size() == 2) {
|
|
//Variable capture, no guards
|
|
ss.add_object(catch_block->children[0]->text, except);
|
|
retval = eval_token(ss, catch_block->children[1]);
|
|
break;
|
|
}
|
|
else if (catch_block->children.size() == 3) {
|
|
//Variable capture, no guards
|
|
ss.add_object(catch_block->children[0]->text, except);
|
|
|
|
bool guard;
|
|
try {
|
|
guard = boxed_cast<bool>(eval_token(ss, catch_block->children[1]));
|
|
} catch (const bad_boxed_cast &) {
|
|
if (node->children.back()->identifier == Token_Type::Finally) {
|
|
eval_token(ss, node->children.back()->children[0]);
|
|
}
|
|
ss.pop_scope();
|
|
throw Eval_Error("Guard condition not boolean", catch_block->children[1]);
|
|
}
|
|
if (guard) {
|
|
retval = eval_token(ss, catch_block->children[2]);
|
|
break;
|
|
}
|
|
}
|
|
else {
|
|
if (node->children.back()->identifier == Token_Type::Finally) {
|
|
eval_token(ss, node->children.back()->children[0]);
|
|
}
|
|
ss.pop_scope();
|
|
throw Eval_Error("Internal error: catch block size unrecognized", catch_block);
|
|
}
|
|
}
|
|
}
|
|
catch (Boxed_Value &bv) {
|
|
Boxed_Value except = bv;
|
|
for (unsigned int i = 1; i < node->children.size(); ++i) {
|
|
TokenPtr catch_block = node->children[i];
|
|
|
|
if (catch_block->children.size() == 1) {
|
|
//No variable capture, no guards
|
|
retval = eval_token(ss, catch_block->children[0]);
|
|
break;
|
|
}
|
|
else if (catch_block->children.size() == 2) {
|
|
//Variable capture, no guards
|
|
ss.add_object(catch_block->children[0]->text, except);
|
|
retval = eval_token(ss, catch_block->children[1]);
|
|
break;
|
|
}
|
|
else if (catch_block->children.size() == 3) {
|
|
//Variable capture, no guards
|
|
ss.add_object(catch_block->children[0]->text, except);
|
|
|
|
bool guard;
|
|
try {
|
|
guard = boxed_cast<bool>(eval_token(ss, catch_block->children[1]));
|
|
} catch (const bad_boxed_cast &) {
|
|
if (node->children.back()->identifier == Token_Type::Finally) {
|
|
eval_token(ss, node->children.back()->children[0]);
|
|
}
|
|
ss.pop_scope();
|
|
throw Eval_Error("Guard condition not boolean", catch_block->children[1]);
|
|
}
|
|
if (guard) {
|
|
retval = eval_token(ss, catch_block->children[2]);
|
|
break;
|
|
}
|
|
}
|
|
else {
|
|
if (node->children.back()->identifier == Token_Type::Finally) {
|
|
eval_token(ss, node->children.back()->children[0]);
|
|
}
|
|
ss.pop_scope();
|
|
throw Eval_Error("Internal error: catch block size unrecognized", catch_block);
|
|
}
|
|
}
|
|
}
|
|
catch (...) {
|
|
if (node->children.back()->identifier == Token_Type::Finally) {
|
|
eval_token(ss, node->children.back()->children[0]);
|
|
}
|
|
ss.pop_scope();
|
|
throw;
|
|
}
|
|
if (node->children.back()->identifier == Token_Type::Finally) {
|
|
retval = eval_token(ss, node->children.back()->children[0]);
|
|
}
|
|
|
|
ss.pop_scope();
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* Evaluates an if/elseif/else block
|
|
*/
|
|
template <typename Eval_System>
|
|
Boxed_Value eval_if(Eval_System &ss, const TokenPtr &node) {
|
|
unsigned int i;
|
|
|
|
Boxed_Value retval = eval_token(ss, node->children[0]);
|
|
bool cond;
|
|
try {
|
|
cond = boxed_cast<bool>(retval);
|
|
}
|
|
catch (const bad_boxed_cast &) {
|
|
throw Eval_Error("If condition not boolean", node->children[0]);
|
|
}
|
|
if (cond) {
|
|
retval = eval_token(ss, node->children[1]);
|
|
}
|
|
else {
|
|
if (node->children.size() > 2) {
|
|
i = 2;
|
|
while ((!cond) && (i < node->children.size())) {
|
|
if (node->children[i]->text == "else") {
|
|
retval = eval_token(ss, node->children[i+1]);
|
|
cond = true;
|
|
}
|
|
else if (node->children[i]->text == "else if") {
|
|
retval = eval_token(ss, node->children[i+1]);
|
|
try {
|
|
cond = boxed_cast<bool>(retval);
|
|
}
|
|
catch (const bad_boxed_cast &) {
|
|
throw Eval_Error("'else if' condition not boolean", node->children[i+1]);
|
|
}
|
|
if (cond) {
|
|
retval = eval_token(ss, node->children[i+2]);
|
|
}
|
|
}
|
|
i = i + 3;
|
|
}
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* Evaluates a while block
|
|
*/
|
|
template <typename Eval_System>
|
|
Boxed_Value eval_while(Eval_System &ss, const TokenPtr &node) {
|
|
bool cond;
|
|
|
|
ss.new_scope();
|
|
|
|
try {
|
|
cond = boxed_cast<bool>(eval_token(ss, node->children[0]));
|
|
}
|
|
catch (const bad_boxed_cast &) {
|
|
ss.pop_scope();
|
|
throw Eval_Error("While condition not boolean", node->children[0]);
|
|
}
|
|
while (cond) {
|
|
try {
|
|
eval_token(ss, node->children[1]);
|
|
try {
|
|
cond = boxed_cast<bool>(eval_token(ss, node->children[0]));
|
|
}
|
|
catch (const bad_boxed_cast &) {
|
|
ss.pop_scope();
|
|
throw Eval_Error("While condition not boolean", node->children[0]);
|
|
}
|
|
}
|
|
catch (Break_Loop &) {
|
|
cond = false;
|
|
}
|
|
}
|
|
ss.pop_scope();
|
|
return Boxed_Value();
|
|
}
|
|
|
|
/**
|
|
* Evaluates a for block, including the for's conditions, from left to right
|
|
*/
|
|
template <typename Eval_System>
|
|
Boxed_Value eval_for(Eval_System &ss, const TokenPtr &node) {
|
|
bool cond;
|
|
|
|
ss.new_scope();
|
|
|
|
try {
|
|
if (node->children.size() == 4) {
|
|
eval_token(ss, node->children[0]);
|
|
cond = boxed_cast<bool>(eval_token(ss, node->children[1]));
|
|
}
|
|
else {
|
|
cond = boxed_cast<bool>(eval_token(ss, node->children[0]));
|
|
}
|
|
}
|
|
catch (const bad_boxed_cast &) {
|
|
ss.pop_scope();
|
|
throw Eval_Error("For condition not boolean", node);
|
|
}
|
|
while (cond) {
|
|
try {
|
|
if (node->children.size() == 4) {
|
|
eval_token(ss, node->children[3]);
|
|
eval_token(ss, node->children[2]);
|
|
cond = boxed_cast<bool>(eval_token(ss, node->children[1]));
|
|
}
|
|
else {
|
|
eval_token(ss, node->children[2]);
|
|
eval_token(ss, node->children[1]);
|
|
cond = boxed_cast<bool>(eval_token(ss, node->children[0]));
|
|
}
|
|
}
|
|
catch (const bad_boxed_cast &) {
|
|
ss.pop_scope();
|
|
throw Eval_Error("For condition not boolean", node);
|
|
}
|
|
catch (Break_Loop &) {
|
|
cond = false;
|
|
}
|
|
}
|
|
ss.pop_scope();
|
|
return Boxed_Value();
|
|
}
|
|
|
|
/**
|
|
* Evaluates a function definition
|
|
*/
|
|
template <typename Eval_System>
|
|
Boxed_Value eval_def(Eval_System &ss, const TokenPtr &node) {
|
|
unsigned int i;
|
|
|
|
std::vector<std::string> param_names;
|
|
std::string annotation = node->annotation?node->annotation->text:"";
|
|
boost::shared_ptr<Dynamic_Proxy_Function> guard;
|
|
size_t numparams = 0;
|
|
std::string function_name = node->children[0]->text;
|
|
TokenPtr guardnode;
|
|
|
|
if ((node->children.size() > 2) && (node->children[1]->identifier == Token_Type::Arg_List)) {
|
|
numparams = node->children[1]->children.size();
|
|
for (i = 0; i < numparams; ++i) {
|
|
param_names.push_back(node->children[1]->children[i]->text);
|
|
}
|
|
|
|
if (node->children.size() > 3) {
|
|
guardnode = node->children[2];
|
|
}
|
|
}
|
|
else {
|
|
//no parameters
|
|
numparams = 0;
|
|
|
|
if (node->children.size() > 2) {
|
|
guardnode = node->children[1];
|
|
}
|
|
}
|
|
|
|
if (guardnode) {
|
|
guard = boost::shared_ptr<Dynamic_Proxy_Function>
|
|
(new Dynamic_Proxy_Function(boost::bind(&eval_function<Eval_System>,
|
|
boost::ref(ss), guardnode,
|
|
param_names, _1), numparams));
|
|
}
|
|
|
|
try {
|
|
ss.add(Proxy_Function
|
|
(new Dynamic_Proxy_Function(boost::bind(&eval_function<Eval_System>,
|
|
boost::ref(ss), node->children.back(),
|
|
param_names, _1), numparams,
|
|
annotation, guard)), function_name);
|
|
}
|
|
catch (reserved_word_error &) {
|
|
throw Eval_Error("Reserved word used as function name '" + function_name + "'", node);
|
|
}
|
|
return Boxed_Value();
|
|
}
|
|
|
|
/**
|
|
* Evaluates a function definition
|
|
*/
|
|
template <typename Eval_System>
|
|
Boxed_Value eval_def_method(Eval_System &ss, const TokenPtr &node) {
|
|
//TODO: Merge with eval_def cleanly someday?
|
|
unsigned int i;
|
|
|
|
std::vector<std::string> param_names;
|
|
std::string annotation = node->annotation?node->annotation->text:"";
|
|
boost::shared_ptr<Dynamic_Proxy_Function> guard;
|
|
size_t numparams;
|
|
std::string class_name = node->children[0]->text;
|
|
std::string function_name = node->children[1]->text;
|
|
TokenPtr guardnode;
|
|
|
|
//The first param of a method is always the implied this ptr.
|
|
param_names.push_back("this");
|
|
|
|
if ((node->children.size() > 3) && (node->children[2]->identifier == Token_Type::Arg_List)) {
|
|
for (i = 0; i < node->children[2]->children.size(); ++i) {
|
|
param_names.push_back(node->children[2]->children[i]->text);
|
|
}
|
|
|
|
if (node->children.size() > 4) {
|
|
guardnode = node->children[3];
|
|
}
|
|
}
|
|
else {
|
|
//no parameters
|
|
|
|
if (node->children.size() > 3) {
|
|
guardnode = node->children[2];
|
|
}
|
|
}
|
|
|
|
numparams = param_names.size();
|
|
|
|
if (guardnode) {
|
|
guard = boost::shared_ptr<Dynamic_Proxy_Function>
|
|
(new Dynamic_Proxy_Function(boost::bind(&eval_function<Eval_System>,
|
|
boost::ref(ss), guardnode,
|
|
param_names, _1), numparams));
|
|
}
|
|
|
|
try {
|
|
if (function_name == class_name) {
|
|
ss.add(Proxy_Function
|
|
(new Dynamic_Object_Constructor(class_name, Proxy_Function(new Dynamic_Proxy_Function(boost::bind(&eval_function<Eval_System>,
|
|
boost::ref(ss), node->children.back(),
|
|
param_names, _1), numparams,
|
|
annotation, guard)))), function_name);
|
|
|
|
}
|
|
else {
|
|
boost::optional<chaiscript::Type_Info> ti;
|
|
try {
|
|
ti = ss.get_type(class_name);
|
|
} catch (const std::range_error &) {
|
|
// No biggie, the type name is just not known
|
|
}
|
|
ss.add(Proxy_Function
|
|
(new Dynamic_Object_Function(class_name, Proxy_Function(new Dynamic_Proxy_Function(boost::bind(&eval_function<Eval_System>,
|
|
boost::ref(ss), node->children.back(),
|
|
param_names, _1), numparams,
|
|
annotation, guard)), ti)), function_name);
|
|
|
|
}
|
|
}
|
|
catch (reserved_word_error &) {
|
|
throw Eval_Error("Reserved word used as method name '" + function_name + "'", node);
|
|
}
|
|
return Boxed_Value();
|
|
}
|
|
|
|
/**
|
|
* Evaluates a lambda (anonymous function)
|
|
*/
|
|
template <typename Eval_System>
|
|
Boxed_Value eval_lambda(Eval_System &ss, const TokenPtr &node) {
|
|
unsigned int i;
|
|
|
|
std::vector<std::string> param_names;
|
|
size_t numparams = 0;
|
|
|
|
if ((node->children.size() > 0) && (node->children[0]->identifier == Token_Type::Arg_List)) {
|
|
numparams = node->children[0]->children.size();
|
|
for (i = 0; i < numparams; ++i) {
|
|
param_names.push_back(node->children[0]->children[i]->text);
|
|
}
|
|
|
|
}
|
|
else {
|
|
//no parameters
|
|
numparams = 0;
|
|
}
|
|
|
|
return Boxed_Value(Proxy_Function(
|
|
new Dynamic_Proxy_Function(
|
|
boost::bind(&eval_function<Eval_System>, boost::ref(ss), node->children.back(), param_names, _1), numparams)));
|
|
}
|
|
|
|
/**
|
|
* Evaluates a scoped block. Handles resetting the scope after the block has completed.
|
|
*/
|
|
template <typename Eval_System>
|
|
Boxed_Value eval_block(Eval_System &ss, const TokenPtr &node) {
|
|
Boxed_Value retval;
|
|
unsigned int i;
|
|
|
|
ss.new_scope();
|
|
for (i = 0; i < node->children.size(); ++i) {
|
|
try {
|
|
retval = eval_token(ss, node->children[i]);
|
|
}
|
|
catch (const chaiscript::Return_Value &rv) {
|
|
ss.pop_scope();
|
|
retval = rv.retval;
|
|
throw;
|
|
}
|
|
catch (...) {
|
|
ss.pop_scope();
|
|
throw;
|
|
}
|
|
}
|
|
ss.pop_scope();
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* Evaluates a return statement
|
|
*/
|
|
template <typename Eval_System>
|
|
Boxed_Value eval_return(Eval_System &ss, const TokenPtr &node) {
|
|
if (node->children.size() > 0) {
|
|
throw Return_Value(eval_token(ss, node->children[0]), node);
|
|
}
|
|
else {
|
|
throw Return_Value(Boxed_Value(), node);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Evaluates a break statement
|
|
*/
|
|
template <typename Eval_System>
|
|
Boxed_Value eval_break(Eval_System &, const TokenPtr &node) {
|
|
throw Break_Loop(node);
|
|
}
|
|
|
|
/**
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* Top-level evaluation dispatch for all AST node types
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*/
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template <typename Eval_System>
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Boxed_Value eval_token(Eval_System &ss, const TokenPtr &node) {
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switch (node->identifier) {
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case (Token_Type::File) :
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return eval_file(ss, node);
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break;
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case (Token_Type::Id) :
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return eval_id(ss, node);
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break;
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case (Token_Type::Float) :
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return eval_float(ss, node);
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break;
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case (Token_Type::Int) :
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return eval_int(ss, node);
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break;
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case (Token_Type::Quoted_String) :
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return eval_quoted_string(ss, node);
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break;
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case (Token_Type::Single_Quoted_String) :
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return eval_single_quoted_string(ss, node);
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break;
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case (Token_Type::Equation) :
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return eval_equation(ss, node);
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break;
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case (Token_Type::Var_Decl) :
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return eval_var_decl(ss, node);
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break;
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case (Token_Type::Expression) :
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return eval_expression(ss, node);
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break;
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case (Token_Type::Comparison) :
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case (Token_Type::Additive) :
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case (Token_Type::Multiplicative) :
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return eval_comp_add_mul(ss, node);
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break;
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case (Token_Type::Array_Call) :
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return eval_array_call(ss, node);
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break;
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case (Token_Type::Negate) :
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return eval_negate(ss, node);
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break;
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case (Token_Type::Not) :
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return eval_not(ss, node);
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break;
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case (Token_Type::Prefix) :
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return eval_prefix(ss, node);
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break;
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case (Token_Type::Inline_Array) :
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return eval_inline_array(ss, node);
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break;
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case (Token_Type::Inline_Range) :
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return eval_inline_range(ss, node);
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break;
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case (Token_Type::Inline_Map) :
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return eval_inline_map(ss, node);
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break;
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case (Token_Type::Fun_Call) :
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return eval_fun_call(ss, node);
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break;
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case (Token_Type::Inplace_Fun_Call) :
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return eval_inplace_fun_call(ss, node);
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break;
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case (Token_Type::Dot_Access) :
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return eval_dot_access(ss, node);
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break;
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case(Token_Type::Try) :
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return eval_try(ss, node);
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break;
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case(Token_Type::If) :
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return eval_if(ss, node);
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break;
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case(Token_Type::While) :
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return eval_while(ss, node);
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break;
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case(Token_Type::For) :
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return eval_for(ss, node);
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break;
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case (Token_Type::Def) :
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return eval_def(ss, node);
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break;
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case (Token_Type::Method) :
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return eval_def_method(ss, node);
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break;
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case (Token_Type::Attr_Decl) :
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return eval_attr_decl(ss, node);
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break;
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case (Token_Type::Lambda) :
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return eval_lambda(ss, node);
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break;
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case (Token_Type::Block) :
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return eval_block(ss, node);
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break;
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case (Token_Type::Return) :
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return eval_return(ss, node);
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break;
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case (Token_Type::Break) :
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return eval_break(ss, node);
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break;
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default :
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return Boxed_Value();
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}
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}
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}
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#endif /* CHAISCRIPT_EVAL_HPP_ */
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