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implemented escape characters when reading/printing an abstract expression with string literals

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This commit is contained in:
krasimir
2015-02-24 09:35:12 +00:00
parent 218c6be0a7
commit da11a7127f
1 changed files with 53 additions and 2 deletions
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55
src/runtime/c/pgf/expr.c
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@@ -310,7 +310,33 @@ pgf_expr_parser_token(PgfExprParser* parser)
pgf_expr_parser_getc(parser);
while (parser->ch != '"' && parser->ch != EOF) {
gu_buf_push(chars, char, parser->ch);
if (parser->ch == '\\') {
pgf_expr_parser_getc(parser);
switch (parser->ch) {
case '\\':
gu_buf_push(chars, char, '\\');
break;
case '"':
gu_buf_push(chars, char, '\"');
break;
case 'n':
gu_buf_push(chars, char, '\n');
break;
case 'r':
gu_buf_push(chars, char, '\r');
break;
case 'b':
gu_buf_push(chars, char, '\b');
break;
case 't':
gu_buf_push(chars, char, '\t');
break;
default:
return;
}
} else {
gu_buf_push(chars, char, parser->ch);
}
pgf_expr_parser_getc(parser);
}
@@ -999,7 +1025,32 @@ pgf_print_literal(PgfLiteral lit,
case PGF_LITERAL_STR: {
PgfLiteralStr* lit = ei.data;
gu_putc('"', out, err);
gu_string_write(lit->val, out, err);
const uint8_t* s = (uint8_t*) lit->val;
while (*s) {
GuUCS c = gu_utf8_decode(&s);
switch (c) {
case '\\':
gu_puts("\\\\", out, err);
break;
case '"':
gu_puts("\\\"", out, err);
break;
case '\n':
gu_puts("\\n", out, err);
break;
case '\r':
gu_puts("\\r", out, err);
break;
case '\b':
gu_puts("\\b", out, err);
break;
case '\t':
gu_puts("\\t", out, err);
break;
default:
gu_out_utf8(c, out, err);
}
}
gu_putc('"', out, err);
break;
}