integrate parser work

1 files changed, 125 insertions, 0 deletions

diff --git a/src/parser_helper.c b/src/parser_helper.c
new file mode 100644
index 0000000..2501f47
--- /dev/null
+++ b/src/parser_helper.c
@@ -0,0 +1,125 @@
+#include <stdarg.h>
+
+#include <cu/parser.h>
+#include <cu/debug.h>
+
+struct parser *create_parser()
+{
+	return calloc(1, sizeof(struct parser));
+}
+
+void destroy_parser(struct parser *p)
+{
+	yylex_destroy(p->lexer);
+	free(p);
+}
+
+void parse(struct parser *p, const char *fname, const char *buf)
+{
+	p->fname = fname;
+	p->buf = buf;
+
+	p->buf_offset = 0;
+	p->comment_nesting = 0;
+
+	p->failed = false;
+
+	yylex_init(&p->lexer);
+	yy_scan_string(buf, p->lexer);
+	yyparse(p->lexer, p);
+}
+
+/* I'm not convinced this is foolproof quite yet, more testing would be nice. */
+int next_interesting_feature(YYSTYPE *yylval, YYLTYPE *yylloc, void *scanner,
+		struct parser *parser)
+{
+	size_t depth = 0;
+	while (1) {
+		int ret = yylex(yylval, yylloc, scanner, parser);
+		if (ret == LBRACE) {
+			depth++;
+			continue;
+		}
+
+		if (ret == RBRACE && depth > 0)
+			depth--;
+
+		if (ret == RBRACE && depth == 0)
+			return 0;
+
+		if (ret == SEMICOLON && depth == 0)
+			return 0;
+
+		/* return fatal error and parser should abort */
+		if (ret == YYEOF)
+			/* some error for unmatched braces would be cool I think */
+			return 1;
+	}
+}
+
+
+struct src_loc to_src_loc(YYLTYPE *yylloc)
+{
+	struct src_loc loc;
+	loc.first_line = yylloc->first_line;
+	loc.last_line = yylloc->last_line;
+	loc.first_col = yylloc->first_column;
+	loc.last_col = yylloc->last_column;
+	return loc;
+}
+
+void yyerror(YYLTYPE *yylloc, void *lexer, struct parser *parser, const char *msg)
+{
+	(void)lexer;
+
+	struct src_issue issue;
+	issue.level = SRC_ERROR;
+	issue.loc = to_src_loc(yylloc);
+	issue.fctx.fbuf = parser->buf;
+	issue.fctx.fname = parser->fname;
+	issue.offset = parser->buf_offset;
+	src_issue(issue, msg);
+}
+
+long long match_escape(char c)
+{
+	switch (c) {
+	case '\'': return '\'';
+	case '\\': return '\\';
+	case 'a': return '\a';
+	case 'b': return '\b';
+	case 'f': return '\f';
+	case 'n': return '\n';
+	case 'r': return '\r';
+	case 't': return '\t';
+	case 'v': return '\v';
+	}
+
+	return c;
+}
+
+const char *clone_string(const char *str)
+{
+	const size_t len = strlen(str) + 1;
+	char *buf = malloc(len);
+	if (!buf) {
+		/* should probably try to handle the error in some way... */
+		internal_error("failed allocating buffer for string clone");
+		return NULL;
+	}
+
+	/* skip quotation marks */
+	size_t j = 0;
+	for (size_t i = 1; i < len - 2; ++i) {
+		char c = str[i];
+
+		if (c == '\\')
+			c = match_escape(str[++i]);
+
+		buf[j++] = c;
+	}
+
+	buf[j] = 0;
+	return buf;
+
+}