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Ensure proper type checking/coercion of "${expr}" 

Now we only rewrite "${expr}" to expr if expr is a string literal.
This commit is contained in:
Eelco Dolstra 2013-10-17 00:57:24 +02:00
parent 9d8a80375d
commit b8034e5581
1 changed files with 3 additions and 2 deletions
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5
src/libexpr/parser.y
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@ -203,7 +203,8 @@ static Expr * stripIndentation(SymbolTable & symbols, vector<Expr *> & es)
es2->push_back(new ExprString(symbols.create(s2)));
}
return es2->size() == 1 ? (*es2)[0] : new ExprConcatStrings(true, es2);
/* If this is a single string, then don't do a concatenation. */
return es2->size() == 1 && dynamic_cast<ExprString *>((*es2)[0]) ? (*es2)[0] : new ExprConcatStrings(true, es2);
}
@ -359,7 +360,7 @@ expr_simple
| '"' string_parts '"' {
/* For efficiency, and to simplify parse trees a bit. */
if ($2->empty()) $$ = new ExprString(data->symbols.create(""));
else if ($2->size() == 1) $$ = $2->front();
else if ($2->size() == 1 && dynamic_cast<ExprString *>($2->front())) $$ = $2->front();
else $$ = new ExprConcatStrings(true, $2);
}
| IND_STRING_OPEN ind_string_parts IND_STRING_CLOSE {