generic-library/ChaiScript
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Fixes to the grammar to prevent endless loops on unmatched strings. Corrections to grammar for cleanliness

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This commit is contained in:
Jonathan Turner
2009-06-10 14:58:35 +00:00
parent e7a0bf70fd
commit 9c1eeb52e7
1 changed files with 12 additions and 6 deletions
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18
wesley/main.cpp
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@@ -196,9 +196,15 @@ Rule build_parser_rules() {
Rule value;
Rule statements;
Rule for_conditions;
Rule source_elem;
Rule source_elems;
Rule statement_list;
Rule rule = *((fundef | statements) >> *(Ign(Id(TokenType::Semicolon))));
statements = *(statement >> *(Ign(Id(TokenType::Semicolon))));
Rule rule = *(Ign(Id(TokenType::Semicolon))) >> source_elems >> *(Ign(Id(TokenType::Semicolon)));
source_elems = source_elem >> *(+Ign(Id(TokenType::Semicolon)) >> source_elem);
source_elem = fundef | statement;
statement_list = statement >> *(+Ign(Id(TokenType::Semicolon)) >> statement);
statement = if_block | while_block | for_block | equation;
if_block = Ign(Str("if")) >> boolean >> block >> *(*Ign(Id(TokenType::Semicolon)) >> Str("elseif") >> boolean >> block) >> ~(*Ign(Id(TokenType::Semicolon)) >> Str("else") >> block);
@@ -207,9 +213,9 @@ Rule build_parser_rules() {
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));
block;
params = Id(TokenType::Identifier) >> *(Ign(Str(",")) >> Id(TokenType::Identifier));
block = *(Ign(Id(TokenType::Semicolon))) >> Ign(Id(TokenType::Curly_Open)) >> *(Ign(Id(TokenType::Semicolon))) >> ~statements >> Ign(Id(TokenType::Curly_Close));
block = *(Ign(Id(TokenType::Semicolon))) >> Ign(Id(TokenType::Curly_Open)) >> *(Ign(Id(TokenType::Semicolon))) >> ~statement_list >> *(Ign(Id(TokenType::Semicolon))) >> Ign(Id(TokenType::Curly_Close));
equation = *(((vardecl | arraycall | Id(TokenType::Identifier)) >> Str("=")) |
((vardecl | arraycall | Id(TokenType::Identifier)) >> Str("+=")) |
((vardecl | arraycall | Id(TokenType::Identifier)) >> Str("-=")) |
@@ -629,12 +635,12 @@ TokenPtr parse(Rule &rule, std::vector<TokenPtr> &tokens, const char *filename)
std::pair<Token_Iterator, bool> results = rule(iter, end, parent);
if (results.second) {
if ((results.second) && (results.first == end)) {
//debug_print(parent, "");
return parent;
}
else {
throw ParserError("Parse failed", *(results.first));
throw ParserError("Parse failed to complete", *(results.first));
}
}