diff options
Diffstat (limited to '')
| -rw-r--r-- | src/mds-kbdc/simplify-tree.c | 86 |
1 files changed, 77 insertions, 9 deletions
diff --git a/src/mds-kbdc/simplify-tree.c b/src/mds-kbdc/simplify-tree.c index 52b3151..938795b 100644 --- a/src/mds-kbdc/simplify-tree.c +++ b/src/mds-kbdc/simplify-tree.c @@ -171,7 +171,7 @@ static int eliminate_alternation(mds_kbdc_tree_t* tree, mds_kbdc_tree_t* argumen for (first = last = NULL; alternative; alternative = next_alternative) { /* Duplicate statement. */ - if (new_tree = mds_kbdc_tree_dup((mds_kbdc_tree_t*)tree), new_tree == NULL) + if (new_tree = mds_kbdc_tree_dup(tree), new_tree == NULL) { int saved_errno = errno; argument->alternation.inner = alternative; @@ -184,7 +184,8 @@ static int eliminate_alternation(mds_kbdc_tree_t* tree, mds_kbdc_tree_t* argumen last = new_tree; first = first ? first : new_tree; /* Jump to the alternation. */ - here = &(new_tree->macro_call.arguments); + here = &(new_tree->macro_call.arguments); /* `new_tree->macro_call.arguments` and + * `new_tree->map.sequence` as the same address. */ for (new_argument = *here, i = 0; i < argument_index; i++, here = &((*here)->next)) new_argument = new_argument->next; /* Detach alternative. */ @@ -318,6 +319,40 @@ static int simplify_macro_call(mds_kbdc_tree_macro_call_t* restrict tree) /** + * Check for bad things in a value statement + * + * @param tree The value statement-tree + * @return Zero on success, -1 on error + */ +static int check_value_statement(mds_kbdc_tree_map_t* restrict tree) +{ + again: + /* Check that there is only one value. */ + if (tree->sequence->next) + NEW_ERROR(tree->sequence->next, ERROR, "more the one value in value statement"); + + /* Check for alternation. */ + if ((tree->sequence->type == C(ALTERNATION)) && (tree->processed != PROCESS_LEVEL)) + NEW_ERROR(tree->sequence, WARNING, + "alternated value statement is undefined unless the alternatives are identical"); + + /* Check for unordered. */ + if (tree->sequence->type != C(UNORDERED)) + return 0; + if (tree->processed != PROCESS_LEVEL) + NEW_ERROR(tree->sequence, WARNING, "use of sequence in value statement is discouraged"); + + /* Simplify argument and start over. */ + //fail_if(simplify(tree->sequence)); + //goto again; + return 0; /* TODO */ + + pfail: + return -1; +} + + +/** * Simplify a mapping-subtree * * @param tree The mapping-subtree @@ -337,16 +372,38 @@ static int simplify_map(mds_kbdc_tree_map_t* restrict tree) if ((argument->type != C(KEYS)) && (argument->type != C(STRING))) NEW_ERROR(argument, ERROR, "not allowed in mapping output"); + /* Valid value properties. */ + if (tree->result == NULL) + fail_if(check_value_statement(tree)); + /* Simplify sequence. */ for (argument = tree->sequence; argument; argument = argument->next) fail_if (simplify(argument)); + /* Test predicted emptyness. */ + for (argument = tree->sequence; argument; argument = argument->next) + if (argument->type != C(NOTHING)) + goto will_not_be_empty; + if (tree->sequence->processed != PROCESS_LEVEL) + NEW_ERROR(tree->sequence, ERROR, "mapping of null sequence"); + /* The tree parsing process will not allow a mapping statement + * to start with a ‘.’. Thus if we select to highlight it we + * know that it is either an empty alternation, an empty + * unordered subsequence or a nothing inside an alternation. + * If it is already been processed by the simplifier, it is an + * error because it is an empty alternation or empty unordered + * subsequence, and there is not reason to print an additional + * error. If however it is a nothing inside an alternation we + * know that it is the cause of the error, however possibily + * in conjunction with additional such constructs, but those + * are harder to locate. */ + return 0; + will_not_be_empty: + /* Remove ‘.’:s. */ REMOVE_NOTHING(sequence); /* Copy sequence. */ - if (tree->sequence == NULL) - return 0; fail_if ((dup_sequence = mds_kbdc_tree_dup(tree->sequence), dup_sequence == NULL)); /* Eliminate alterations, remember, unordered subsequences have @@ -588,11 +645,12 @@ static int simplify_unordered(mds_kbdc_tree_unordered_t* restrict tree) mds_kbdc_tree_t** here; int allow_long = 0; size_t argument_count; - int argv_force = 1; /* TODO globals.h */ + int argv_force = 0; /* TODO globals.h */ /* Test for ‘(( ))’. */ if (tree->inner && (tree->inner->next == NULL) && (tree->inner->type == C(UNORDERED))) { + tree->loc_end = tree->inner->loc_end; temp = tree->inner; tree->inner = tree->inner->unordered.inner; temp->unordered.inner = NULL; @@ -622,7 +680,16 @@ static int simplify_unordered(mds_kbdc_tree_unordered_t* restrict tree) /* Remove ‘.’:s. */ REMOVE_NOTHING(inner); - /* Simplify. */ + /* Check that the sequnced contained anything else. */ + if (tree->inner == NULL) + { + NEW_ERROR(tree, ERROR, "unordered subsequence contained nothing else than ‘.’"); + tree->type = C(NOTHING); + tree->processed = PROCESS_LEVEL; + return 0; + } + + /* Simplify. */ /* TODO test */ for (argument = tree->inner, argument_count = 0; argument; argument = argument->next, argument_count++) if (argument->type == C(ALTERNATION)) { @@ -640,10 +707,11 @@ static int simplify_unordered(mds_kbdc_tree_unordered_t* restrict tree) if ((argument_count > 5) && (allow_long * argv_force == 0)) { if (allow_long == 0) - NEW_ERROR(argument, ERROR, "unordered subsequence longer than 5 elements need double brackets"); + NEW_ERROR(tree->inner, ERROR, + "unordered subsequence longer than 5 elements need double brackets"); else if (argv_force == 0) - NEW_ERROR(argument, ERROR, "unordered subsequence of size %zu found, requires ‘--force’ to compile", - argument_count); + NEW_ERROR(tree->inner, ERROR, + "unordered subsequence of size %zu found, requires ‘--force’ to compile", argument_count); return 0; } |