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Show offending lookahead chars when pretty-printing trees w/ errors

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This commit is contained in:
Max Brunsfeld 2014-05-26 21:50:01 -07:00
parent 844f73c193
commit 2988cc5aa2
5 changed files with 31 additions and 16 deletions
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17
src/runtime/tree.c
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@ -124,14 +124,27 @@ ts_tree ** ts_tree_children(const ts_tree *tree, size_t *count) {
return tree->data.children.contents;
}
static size_t write_lookahead_to_string(char *string, size_t limit, char lookahead) {
switch (lookahead) {
case '\0':
return snprintf(string, limit, "<EOF>");
default:
return snprintf(string, limit, "'%c'", lookahead);
}
}
static size_t tree_write_to_string(const ts_tree *tree, const char **symbol_names, char *string, size_t limit) {
char *cursor = string;
char **destination = (limit > 0) ? &cursor : &string;
if (!tree)
return snprintf(*destination, limit, "(NULL)");
if (tree->symbol == ts_builtin_sym_error)
return snprintf(*destination, limit, "(ERROR)");
if (tree->symbol == ts_builtin_sym_error) {
cursor += snprintf(*destination, limit, "(ERROR ");
cursor += write_lookahead_to_string(*destination, limit, tree->data.error.lookahead_char);
cursor += snprintf(*destination, limit, ")");
return cursor - string;
}
cursor += snprintf(*destination, limit, "(%s", symbol_names[tree->symbol]);
size_t count;