diff options
| -rw-r--r-- | src/mds-kbdc/make-tree.c | 62 |
1 files changed, 58 insertions, 4 deletions
diff --git a/src/mds-kbdc/make-tree.c b/src/mds-kbdc/make-tree.c index 1e85094..c3bdc81 100644 --- a/src/mds-kbdc/make-tree.c +++ b/src/mds-kbdc/make-tree.c @@ -310,6 +310,49 @@ CHARS_END +/** + * Check that the next word is a specific keyword + * + * @parma KEYWORD:const char* The keyword + */ +#define TEST_FOR_KEYWORD(KEYWORD) \ + do \ + { \ + if (too_few) \ + break; \ + line += strlen(line); \ + *end = prev_end_char, prev_end_char = '\0'; \ + while (*line && (*line == ' ')) \ + line++; \ + if (*line == '\0') \ + { \ + line = original, end = line + strlen(line); \ + NEW_ERROR(1, ERROR, "too few parameters"); \ + line = end, too_few = 1; \ + } \ + else \ + { \ + int ok = (strstr(line, KEYWORD) == line); \ + line += strlen(KEYWORD); \ + ok = ok && ((*line == '\0') || (*line == ' ')); \ + if (ok) \ + { \ + end = line; \ + prev_end_char = *end, *end = '\0'; \ + break; \ + } \ + line -= strlen(KEYWORD); \ + end = line; \ + while (*end && (*end != ' ')) \ + end++; \ + prev_end_char = *end, *end = '\0'; \ + NEW_ERROR(1, ERROR, "expecting keyword ‘%s’", KEYWORD); \ + } \ + } \ + while (0) + + + /** * Parse a file into a syntex tree @@ -504,9 +547,19 @@ int parse_to_tree(const char* restrict filename, mds_kbdc_tree_t** restrict resu NEW_ERROR(1, ERROR, "expecting nothing or ‘if’"); } } - else if (!strcmp(line, "for")) ; - else if (!strcmp(line, "let")) ; - else if (!strcmp(line, "have")) ; + else if (!strcmp(line, "for")) + { + NEW_NODE(for, FOR); + CHARS(first); + TEST_FOR_KEYWORD("to"); + CHARS(last); + TEST_FOR_KEYWORD("as"); + CHARS(variable); + CHARS_END; + BRANCH("for"); + } + else if (!strcmp(line, "let")) ; /* TODO */ + else if (!strcmp(line, "have")) ; /* TODO */ else if (!strcmp(line, "have_chars")) { NEW_NODE(assumption_have_chars, ASSUMPTION_HAVE_CHARS); @@ -545,7 +598,7 @@ int parse_to_tree(const char* restrict filename, mds_kbdc_tree_t** restrict resu tree_stack[stack_ptr] = &(tree_stack[stack_ptr][0]->next); } else if (strchr("\"<([", *line) || strchr(line, '(')) - ; + ; /* TODO */ else { /* TODO not a keyword if it contains special characters */ @@ -576,6 +629,7 @@ int parse_to_tree(const char* restrict filename, mds_kbdc_tree_t** restrict resu +#undef TEST_FOR_KEYWORD #undef QUOTES_1 #undef QUOTES #undef CHARS_END |