generic-library/ChaiScript
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Added prelim for loop support

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This commit is contained in:
Jonathan Turner 2009-06-08 15:12:33 +00:00
parent 674f6cb4ce
commit 5752ef0667
2 changed files with 42 additions and 3 deletions
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7
samples/for.wes Normal file
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@ -0,0 +1,7 @@
for (var i = 0; i < 10; i += 1) {
print(i)
}
for (i = 10; i >= 0; i -= 2) {
print(i)
}

38
wesley/main.cpp
View File

@ -16,14 +16,15 @@
class TokenType { public: enum Type { File, Whitespace, Identifier, Integer, Operator, Parens_Open, Parens_Close,
Square_Open, Square_Close, Curly_Open, Curly_Close, Comma, Quoted_String, Single_Quoted_String, Carriage_Return, Semicolon,
Function_Def, Scoped_Block, Statement, Equation, Return, Expression, Term, Factor, Negate, Comment,
Value, Fun_Call, Method_Call, Comparison, If_Block, While_Block, Boolean, Real_Number, Array_Call, Variable_Decl, Array_Init }; };
Value, Fun_Call, Method_Call, Comparison, If_Block, While_Block, Boolean, Real_Number, Array_Call, Variable_Decl, Array_Init,
For_Block }; };
const char *tokentype_to_string(int tokentype) {
const char *token_types[] = {"File", "Whitespace", "Identifier", "Integer", "Operator", "Parens_Open", "Parens_Close",
"Square_Open", "Square_Close", "Curly_Open", "Curly_Close", "Comma", "Quoted_String", "Single_Quoted_String", "Carriage_Return", "Semicolon",
"Function_Def", "Scoped_Block", "Statement", "Equation", "Return", "Expression", "Term", "Factor", "Negate", "Comment",
"Value", "Fun_Call", "Method_Call", "Comparison", "If_Block", "While_Block", "Boolean", "Real Number", "Array_Call", "Variable_Decl", "Array_Init"
};
"For_Block" };
return token_types[tokentype];
}
@ -335,6 +336,31 @@ Boxed_Value eval_token(BoxedCPP_System &ss, TokenPtr node) {
retval = Boxed_Value();
}
break;
case(TokenType::For_Block) : {
Boxed_Value condition;
bool cond;
try {
eval_token(ss, node->children[0]);
condition = eval_token(ss, node->children[1]);
cond = Cast_Helper<bool &>()(condition);
}
catch (std::exception) {
throw EvalError("For condition not boolean", node->children[0]);
}
while (cond) {
eval_token(ss, node->children[3]);
try {
eval_token(ss, node->children[2]);
condition = eval_token(ss, node->children[1]);
cond = Cast_Helper<bool &>()(condition);
}
catch (std::exception) {
throw EvalError("For condition not boolean", node->children[0]);
}
}
retval = Boxed_Value();
}
break;
case (TokenType::Function_Def) : {
unsigned int num_args = node->children.size() - 2;
std::vector<std::string> param_names;
@ -391,18 +417,24 @@ Rule build_parser_rules() {
Rule methodcall(TokenType::Method_Call);
Rule if_block(TokenType::If_Block);
Rule while_block(TokenType::While_Block);
Rule for_block(TokenType::For_Block);
Rule arraycall(TokenType::Array_Call);
Rule vardecl(TokenType::Variable_Decl);
Rule arrayinit(TokenType::Array_Init);
Rule value;
Rule statements;
Rule for_conditions;
Rule rule = *((fundef | statements) >> *(Ign(Id(TokenType::Semicolon))));
statements = (statement >> *(Ign(Id(TokenType::Semicolon)) >> statement) >> *(Ign(Id(TokenType::Semicolon))));
statement = if_block | while_block | equation;
statement = if_block | while_block | for_block | equation;
if_block = Ign(Str("if")) >> boolean >> block >> *(Str("elseif") >> boolean >> block) >> ~(Str("else") >> block);
while_block = Ign(Str("while")) >> boolean >> block;
for_block = Ign(Str("for")) >> for_conditions >> block;
for_conditions = Ign(Id(TokenType::Parens_Open)) >> equation >> Ign(Str(";")) >> boolean >> Ign(Str(";")) >> equation >> Ign(Id(TokenType::Parens_Close));
fundef = Ign(Str("def")) >> Id(TokenType::Identifier) >> ~(Ign(Id(TokenType::Parens_Open)) >> ~params >> Ign(Id(TokenType::Parens_Close))) >>
block >> ~Ign(Id(TokenType::Semicolon));
params = Id(TokenType::Identifier) >> *(Ign(Str(",")) >> Id(TokenType::Identifier));