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-rw-r--r--sway/criteria.c445
1 files changed, 445 insertions, 0 deletions
diff --git a/sway/criteria.c b/sway/criteria.c
new file mode 100644
index 00000000..2eee331c
--- /dev/null
+++ b/sway/criteria.c
@@ -0,0 +1,445 @@
+#define _XOPEN_SOURCE 700
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <pcre.h>
+#include "sway/criteria.h"
+#include "sway/container.h"
+#include "sway/config.h"
+#include "sway/view.h"
+#include "stringop.h"
+#include "list.h"
+#include "log.h"
+
+enum criteria_type { // *must* keep in sync with criteria_strings[]
+ CRIT_APP_ID,
+ CRIT_CLASS,
+ CRIT_CON_ID,
+ CRIT_CON_MARK,
+ CRIT_FLOATING,
+ CRIT_ID,
+ CRIT_INSTANCE,
+ CRIT_TILING,
+ CRIT_TITLE,
+ CRIT_URGENT,
+ CRIT_WINDOW_ROLE,
+ CRIT_WINDOW_TYPE,
+ CRIT_WORKSPACE,
+ CRIT_LAST
+};
+
+static const char * const criteria_strings[CRIT_LAST] = {
+ [CRIT_APP_ID] = "app_id",
+ [CRIT_CLASS] = "class",
+ [CRIT_CON_ID] = "con_id",
+ [CRIT_CON_MARK] = "con_mark",
+ [CRIT_FLOATING] = "floating",
+ [CRIT_ID] = "id",
+ [CRIT_INSTANCE] = "instance",
+ [CRIT_TILING] = "tiling",
+ [CRIT_TITLE] = "title",
+ [CRIT_URGENT] = "urgent", // either "latest" or "oldest" ...
+ [CRIT_WINDOW_ROLE] = "window_role",
+ [CRIT_WINDOW_TYPE] = "window_type",
+ [CRIT_WORKSPACE] = "workspace"
+};
+
+/**
+ * A single criteria token (ie. value/regex pair),
+ * e.g. 'class="some class regex"'.
+ */
+struct crit_token {
+ enum criteria_type type;
+ pcre *regex;
+ char *raw;
+};
+
+static void free_crit_token(struct crit_token *crit) {
+ pcre_free(crit->regex);
+ free(crit->raw);
+ free(crit);
+}
+
+static void free_crit_tokens(list_t *crit_tokens) {
+ for (int i = 0; i < crit_tokens->length; i++) {
+ free_crit_token(crit_tokens->items[i]);
+ }
+ list_free(crit_tokens);
+}
+
+// Extracts criteria string from its brackets. Returns new (duplicate)
+// substring.
+static char *criteria_from(const char *arg) {
+ char *criteria = NULL;
+ if (*arg == '[') {
+ criteria = strdup(arg + 1);
+ } else {
+ criteria = strdup(arg);
+ }
+
+ int last = strlen(criteria) - 1;
+ if (criteria[last] == ']') {
+ criteria[last] = '\0';
+ }
+ return criteria;
+}
+
+// Return instances of c found in str.
+static int countchr(char *str, char c) {
+ int found = 0;
+ for (int i = 0; str[i]; i++) {
+ if (str[i] == c) {
+ ++found;
+ }
+ }
+ return found;
+}
+
+// criteria_str is e.g. '[class="some class regex" instance="instance name"]'.
+//
+// Will create array of pointers in buf, where first is duplicate of given
+// string (must be freed) and the rest are pointers to names and values in the
+// base string (every other, naturally). argc will be populated with the length
+// of buf.
+//
+// Returns error string or NULL if successful.
+static char *crit_tokens(int *argc, char ***buf,
+ const char * const criteria_str) {
+ wlr_log(L_DEBUG, "Parsing criteria: '%s'", criteria_str);
+ char *base = criteria_from(criteria_str);
+ char *head = base;
+ char *namep = head; // start of criteria name
+ char *valp = NULL; // start of value
+
+ // We're going to place EOS markers where we need to and fill up an array
+ // of pointers to the start of each token (either name or value).
+ int pairs = countchr(base, '=');
+ int max_tokens = pairs * 2 + 1; // this gives us at least enough slots
+
+ char **argv = *buf = calloc(max_tokens, sizeof(char*));
+ argv[0] = base; // this needs to be freed by caller
+ bool quoted = true;
+
+ *argc = 1; // uneven = name, even = value
+ while (*head && *argc < max_tokens) {
+ if (namep != head && *(head - 1) == '\\') {
+ // escaped character: don't try to parse this
+ } else if (*head == '=' && namep != head) {
+ if (*argc % 2 != 1) {
+ // we're not expecting a name
+ return strdup("Unable to parse criteria: "
+ "Found out of place equal sign");
+ } else {
+ // name ends here
+ char *end = head; // don't want to rewind the head
+ while (*(end - 1) == ' ') {
+ --end;
+ }
+ *end = '\0';
+ if (*(namep) == ' ') {
+ namep = strrchr(namep, ' ') + 1;
+ }
+ argv[*argc] = namep;
+ *argc += 1;
+ }
+ } else if (*head == '"') {
+ if (*argc % 2 != 0) {
+ // we're not expecting a value
+ return strdup("Unable to parse criteria: "
+ "Found quoted value where it was not expected");
+ } else if (!valp) { // value starts here
+ valp = head + 1;
+ quoted = true;
+ } else {
+ // value ends here
+ argv[*argc] = valp;
+ *argc += 1;
+ *head = '\0';
+ valp = NULL;
+ namep = head + 1;
+ }
+ } else if (*argc % 2 == 0 && *head != ' ') {
+ // parse unquoted values
+ if (!valp) {
+ quoted = false;
+ valp = head; // value starts here
+ }
+ } else if (valp && !quoted && *head == ' ') {
+ // value ends here
+ argv[*argc] = valp;
+ *argc += 1;
+ *head = '\0';
+ valp = NULL;
+ namep = head + 1;
+ }
+ head++;
+ }
+
+ // catch last unquoted value if needed
+ if (valp && !quoted && !*head) {
+ argv[*argc] = valp;
+ *argc += 1;
+ }
+
+ return NULL;
+}
+
+// Returns error string on failure or NULL otherwise.
+static char *parse_criteria_name(enum criteria_type *type, char *name) {
+ *type = CRIT_LAST;
+ for (int i = 0; i < CRIT_LAST; i++) {
+ if (strcmp(criteria_strings[i], name) == 0) {
+ *type = (enum criteria_type) i;
+ break;
+ }
+ }
+ if (*type == CRIT_LAST) {
+ const char *fmt = "Criteria type '%s' is invalid or unsupported.";
+ int len = strlen(name) + strlen(fmt) - 1;
+ char *error = malloc(len);
+ snprintf(error, len, fmt, name);
+ return error;
+ } else if (*type == CRIT_URGENT || *type == CRIT_WINDOW_ROLE ||
+ *type == CRIT_WINDOW_TYPE) {
+ // (we're just being helpful here)
+ const char *fmt = "\"%s\" criteria currently unsupported, "
+ "no window will match this";
+ int len = strlen(fmt) + strlen(name) - 1;
+ char *error = malloc(len);
+ snprintf(error, len, fmt, name);
+ return error;
+ }
+ return NULL;
+}
+
+// Returns error string on failure or NULL otherwise.
+static char *generate_regex(pcre **regex, char *value) {
+ const char *reg_err;
+ int offset;
+
+ *regex = pcre_compile(value, PCRE_UTF8 | PCRE_UCP, &reg_err, &offset, NULL);
+
+ if (!*regex) {
+ const char *fmt = "Regex compilation (for '%s') failed: %s";
+ int len = strlen(fmt) + strlen(value) + strlen(reg_err) - 3;
+ char *error = malloc(len);
+ snprintf(error, len, fmt, value, reg_err);
+ return error;
+ }
+ return NULL;
+}
+
+// Test whether the criterion corresponds to the currently focused window
+static bool crit_is_focused(const char *value) {
+ return !strcmp(value, "focused") || !strcmp(value, "__focused__");
+}
+
+// Populate list with crit_tokens extracted from criteria string, returns error
+// string or NULL if successful.
+char *extract_crit_tokens(list_t *tokens, const char * const criteria) {
+ int argc;
+ char **argv = NULL, *error = NULL;
+ if ((error = crit_tokens(&argc, &argv, criteria))) {
+ goto ect_cleanup;
+ }
+ for (int i = 1; i + 1 < argc; i += 2) {
+ char* name = argv[i], *value = argv[i + 1];
+ struct crit_token *token = calloc(1, sizeof(struct crit_token));
+ token->raw = strdup(value);
+
+ if ((error = parse_criteria_name(&token->type, name))) {
+ free_crit_token(token);
+ goto ect_cleanup;
+ } else if (token->type == CRIT_URGENT || crit_is_focused(value)) {
+ wlr_log(L_DEBUG, "%s -> \"%s\"", name, value);
+ list_add(tokens, token);
+ } else if((error = generate_regex(&token->regex, value))) {
+ free_crit_token(token);
+ goto ect_cleanup;
+ } else {
+ wlr_log(L_DEBUG, "%s -> /%s/", name, value);
+ list_add(tokens, token);
+ }
+ }
+ect_cleanup:
+ free(argv[0]); // base string
+ free(argv);
+ return error;
+}
+
+static int regex_cmp(const char *item, const pcre *regex) {
+ return pcre_exec(regex, NULL, item, strlen(item), 0, 0, NULL, 0);
+}
+
+// test a single view if it matches list of criteria tokens (all of them).
+static bool criteria_test(swayc_t *cont, list_t *tokens) {
+ if (cont->type != C_VIEW) {
+ return false;
+ }
+ int matches = 0;
+ for (int i = 0; i < tokens->length; i++) {
+ struct crit_token *crit = tokens->items[i];
+ switch (crit->type) {
+ case CRIT_CLASS:
+ {
+ const char *class = view_get_class(cont->sway_view);
+ if (!class) {
+ break;
+ }
+ if (crit->regex && regex_cmp(class, crit->regex) == 0) {
+ matches++;
+ }
+ break;
+ }
+ case CRIT_CON_ID:
+ {
+ char *endptr;
+ size_t crit_id = strtoul(crit->raw, &endptr, 10);
+
+ if (*endptr == 0 && cont->id == crit_id) {
+ ++matches;
+ }
+ break;
+ }
+ case CRIT_CON_MARK:
+ // TODO
+ break;
+ case CRIT_FLOATING:
+ // TODO
+ break;
+ case CRIT_ID:
+ // TODO
+ break;
+ case CRIT_APP_ID:
+ {
+ const char *app_id = view_get_app_id(cont->sway_view);
+ if (!app_id) {
+ break;
+ }
+
+ if (crit->regex && regex_cmp(app_id, crit->regex) == 0) {
+ matches++;
+ }
+ break;
+ }
+ case CRIT_INSTANCE:
+ {
+ const char *instance = view_get_instance(cont->sway_view);
+ if (!instance) {
+ break;
+ }
+
+ if (crit->regex && regex_cmp(instance, crit->regex) == 0) {
+ matches++;
+ }
+ break;
+ }
+ case CRIT_TILING:
+ // TODO
+ break;
+ case CRIT_TITLE:
+ {
+ const char *title = view_get_title(cont->sway_view);
+ if (!title) {
+ break;
+ }
+
+ if (crit->regex && regex_cmp(title, crit->regex) == 0) {
+ matches++;
+ }
+ break;
+ }
+ case CRIT_URGENT:
+ // TODO "latest" or "oldest"
+ break;
+ case CRIT_WINDOW_ROLE:
+ // TODO
+ break;
+ case CRIT_WINDOW_TYPE:
+ // TODO
+ break;
+ case CRIT_WORKSPACE:
+ // TODO
+ break;
+ default:
+ sway_abort("Invalid criteria type (%i)", crit->type);
+ break;
+ }
+ }
+ return matches == tokens->length;
+}
+
+int criteria_cmp(const void *a, const void *b) {
+ if (a == b) {
+ return 0;
+ } else if (!a) {
+ return -1;
+ } else if (!b) {
+ return 1;
+ }
+ const struct criteria *crit_a = a, *crit_b = b;
+ int cmp = lenient_strcmp(crit_a->cmdlist, crit_b->cmdlist);
+ if (cmp != 0) {
+ return cmp;
+ }
+ return lenient_strcmp(crit_a->crit_raw, crit_b->crit_raw);
+}
+
+void free_criteria(struct criteria *crit) {
+ if (crit->tokens) {
+ free_crit_tokens(crit->tokens);
+ }
+ if (crit->cmdlist) {
+ free(crit->cmdlist);
+ }
+ if (crit->crit_raw) {
+ free(crit->crit_raw);
+ }
+ free(crit);
+}
+
+bool criteria_any(swayc_t *cont, list_t *criteria) {
+ for (int i = 0; i < criteria->length; i++) {
+ struct criteria *bc = criteria->items[i];
+ if (criteria_test(cont, bc->tokens)) {
+ return true;
+ }
+ }
+ return false;
+}
+
+list_t *criteria_for(swayc_t *cont) {
+ list_t *criteria = config->criteria, *matches = create_list();
+ for (int i = 0; i < criteria->length; i++) {
+ struct criteria *bc = criteria->items[i];
+ if (criteria_test(cont, bc->tokens)) {
+ list_add(matches, bc);
+ }
+ }
+ return matches;
+}
+
+struct list_tokens {
+ list_t *list;
+ list_t *tokens;
+};
+
+static void container_match_add(swayc_t *container,
+ struct list_tokens *list_tokens) {
+ if (criteria_test(container, list_tokens->tokens)) {
+ list_add(list_tokens->list, container);
+ }
+}
+
+list_t *container_for_crit_tokens(list_t *tokens) {
+ struct list_tokens list_tokens =
+ (struct list_tokens){create_list(), tokens};
+
+ container_map(&root_container,
+ (void (*)(swayc_t *, void *))container_match_add,
+ &list_tokens);
+
+ // TODO look in the scratchpad
+
+ return list_tokens.list;
+}
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