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+/*
+ * Compton - a compositor for X11
+ *
+ * Based on `xcompmgr` - Copyright (c) 2003, Keith Packard
+ *
+ * Copyright (c) 2011-2013, Christopher Jeffrey
+ * See LICENSE for more information.
+ *
+ */
+
+#include "common.h"
+
+#include <fnmatch.h>
+#include <ctype.h>
+
+// libpcre
+#ifdef CONFIG_REGEX_PCRE
+#include <pcre.h>
+
+// For compatiblity with <libpcre-8.20
+#ifndef PCRE_STUDY_JIT_COMPILE
+#define PCRE_STUDY_JIT_COMPILE 0
+#define LPCRE_FREE_STUDY(extra) pcre_free(extra)
+#else
+#define LPCRE_FREE_STUDY(extra) pcre_free_study(extra)
+#endif
+
+#endif
+
+#define C2_MAX_LEVELS 10
+
+typedef struct _c2_b c2_b_t;
+typedef struct _c2_l c2_l_t;
+
+/// Pointer to a condition tree.
+typedef struct {
+ bool isbranch : 1;
+ union {
+ c2_b_t *b;
+ c2_l_t *l;
+ };
+} c2_ptr_t;
+
+/// Initializer for c2_ptr_t.
+#define C2_PTR_INIT { \
+ .isbranch = false, \
+ .l = NULL, \
+}
+
+const static c2_ptr_t C2_PTR_NULL = C2_PTR_INIT;
+
+/// Operator of a branch element.
+typedef enum {
+ C2_B_OUNDEFINED,
+ C2_B_OAND,
+ C2_B_OOR,
+ C2_B_OXOR,
+} c2_b_op_t;
+
+/// Structure for branch element in a window condition
+struct _c2_b {
+ bool neg : 1;
+ c2_b_op_t op;
+ c2_ptr_t opr1;
+ c2_ptr_t opr2;
+};
+
+/// Initializer for c2_b_t.
+#define C2_B_INIT { \
+ .neg = false, \
+ .op = C2_B_OUNDEFINED, \
+ .opr1 = C2_PTR_INIT, \
+ .opr2 = C2_PTR_INIT, \
+}
+
+/// Structure for leaf element in a window condition
+struct _c2_l {
+ bool neg : 1;
+ enum {
+ C2_L_OEXISTS,
+ C2_L_OEQ,
+ C2_L_OGT,
+ C2_L_OGTEQ,
+ C2_L_OLT,
+ C2_L_OLTEQ,
+ } op : 3;
+ enum {
+ C2_L_MEXACT,
+ C2_L_MSTART,
+ C2_L_MCONTAINS,
+ C2_L_MWILDCARD,
+ C2_L_MPCRE,
+ } match : 3;
+ bool match_ignorecase : 1;
+ char *tgt;
+ Atom tgtatom;
+ bool tgt_onframe;
+ int index;
+ enum {
+ C2_L_PUNDEFINED,
+ C2_L_PID,
+ C2_L_POVREDIR,
+ C2_L_PFOCUSED,
+ C2_L_PWMWIN,
+ C2_L_PCLIENT,
+ C2_L_PWINDOWTYPE,
+ C2_L_PLEADER,
+ C2_L_PNAME,
+ C2_L_PCLASSG,
+ C2_L_PCLASSI,
+ C2_L_PROLE,
+ } predef;
+ enum c2_l_type {
+ C2_L_TUNDEFINED,
+ C2_L_TSTRING,
+ C2_L_TCARDINAL,
+ C2_L_TWINDOW,
+ C2_L_TATOM,
+ C2_L_TDRAWABLE,
+ } type;
+ int format;
+ enum {
+ C2_L_PTUNDEFINED,
+ C2_L_PTSTRING,
+ C2_L_PTINT,
+ } ptntype;
+ char *ptnstr;
+ long ptnint;
+#ifdef CONFIG_REGEX_PCRE
+ pcre *regex_pcre;
+ pcre_extra *regex_pcre_extra;
+#endif
+};
+
+/// Initializer for c2_l_t.
+#define C2_L_INIT { \
+ .neg = false, \
+ .op = C2_L_OEXISTS, \
+ .match = C2_L_MEXACT, \
+ .match_ignorecase = false, \
+ .tgt = NULL, \
+ .tgtatom = 0, \
+ .tgt_onframe = false, \
+ .predef = C2_L_PUNDEFINED, \
+ .index = -1, \
+ .type = C2_L_TUNDEFINED, \
+ .format = 0, \
+ .ptntype = C2_L_PTUNDEFINED, \
+ .ptnstr = NULL, \
+ .ptnint = 0, \
+}
+
+const static c2_l_t leaf_def = C2_L_INIT;
+
+/// Linked list type of conditions.
+struct _c2_lptr {
+ c2_ptr_t ptr;
+ struct _c2_lptr *next;
+};
+
+/// Initializer for c2_lptr_t.
+#define C2_LPTR_INIT { \
+ .ptr = C2_PTR_INIT, \
+ .next = NULL, \
+}
+
+/// Structure representing a predefined target.
+typedef struct {
+ const char *name;
+ enum c2_l_type type;
+ int format;
+} c2_predef_t;
+
+// Predefined targets.
+const static c2_predef_t C2_PREDEFS[] = {
+ [C2_L_PID ] = { "id" , C2_L_TCARDINAL , 0 },
+ [C2_L_POVREDIR ] = { "override_redirect" , C2_L_TCARDINAL , 0 },
+ [C2_L_PFOCUSED ] = { "focused" , C2_L_TCARDINAL , 0 },
+ [C2_L_PWMWIN ] = { "wmwin" , C2_L_TCARDINAL , 0 },
+ [C2_L_PCLIENT ] = { "client" , C2_L_TWINDOW , 0 },
+ [C2_L_PWINDOWTYPE ] = { "window_type" , C2_L_TSTRING , 0 },
+ [C2_L_PLEADER ] = { "leader" , C2_L_TWINDOW , 0 },
+ [C2_L_PNAME ] = { "name" , C2_L_TSTRING , 0 },
+ [C2_L_PCLASSG ] = { "class_g" , C2_L_TSTRING , 0 },
+ [C2_L_PCLASSI ] = { "class_i" , C2_L_TSTRING , 0 },
+ [C2_L_PROLE ] = { "role" , C2_L_TSTRING , 0 },
+};
+
+#define mstrncmp(s1, s2) strncmp((s1), (s2), strlen(s1))
+
+/**
+ * Compare next word in a string with another string.
+ */
+static inline int
+strcmp_wd(const char *needle, const char *src) {
+ int ret = mstrncmp(needle, src);
+ if (ret)
+ return ret;
+
+ char c = src[strlen(needle)];
+ if (isalnum(c) || '_' == c)
+ return 1;
+ else
+ return 0;
+}
+
+/**
+ * Return whether a c2_ptr_t is empty.
+ */
+static inline bool
+c2_ptr_isempty(const c2_ptr_t p) {
+ return !(p.isbranch ? (bool) p.b: (bool) p.l);
+}
+
+/**
+ * Reset a c2_ptr_t.
+ */
+static inline void
+c2_ptr_reset(c2_ptr_t *pp) {
+ if (pp)
+ memcpy(pp, &C2_PTR_NULL, sizeof(c2_ptr_t));
+}
+
+/**
+ * Combine two condition trees.
+ */
+static inline c2_ptr_t
+c2h_comb_tree(c2_b_op_t op, c2_ptr_t p1, c2_ptr_t p2) {
+ c2_ptr_t p = {
+ .isbranch = true,
+ .b = malloc(sizeof(c2_b_t))
+ };
+
+ p.b->opr1 = p1;
+ p.b->opr2 = p2;
+ p.b->op = op;
+
+ return p;
+}
+
+/**
+ * Get the precedence value of a condition branch operator.
+ */
+static inline int
+c2h_b_opp(c2_b_op_t op) {
+ switch (op) {
+ case C2_B_OAND: return 2;
+ case C2_B_OOR: return 1;
+ case C2_B_OXOR: return 1;
+ default: break;
+ }
+
+ assert(0);
+ return 0;
+}
+
+/**
+ * Compare precedence of two condition branch operators.
+ *
+ * Associativity is left-to-right, forever.
+ *
+ * @return positive number if op1 > op2, 0 if op1 == op2 in precedence,
+ * negative number otherwise
+ */
+static inline int
+c2h_b_opcmp(c2_b_op_t op1, c2_b_op_t op2) {
+ return c2h_b_opp(op1) - c2h_b_opp(op2);
+}
+
+static int
+c2_parse_grp(session_t *ps, const char *pattern, int offset, c2_ptr_t *presult, int level);
+
+static int
+c2_parse_target(session_t *ps, const char *pattern, int offset, c2_ptr_t *presult);
+
+static int
+c2_parse_op(const char *pattern, int offset, c2_ptr_t *presult);
+
+static int
+c2_parse_pattern(session_t *ps, const char *pattern, int offset, c2_ptr_t *presult);
+
+static int
+c2_parse_legacy(session_t *ps, const char *pattern, int offset, c2_ptr_t *presult);
+
+static bool
+c2_l_postprocess(session_t *ps, c2_l_t *pleaf);
+
+static void
+c2_free(c2_ptr_t p);
+
+/**
+ * Wrapper of c2_free().
+ */
+static inline void
+c2_freep(c2_ptr_t *pp) {
+ if (pp) {
+ c2_free(*pp);
+ c2_ptr_reset(pp);
+ }
+}
+
+static const char *
+c2h_dump_str_tgt(const c2_l_t *pleaf);
+
+static const char *
+c2h_dump_str_type(const c2_l_t *pleaf);
+
+static void
+c2_dump_raw(c2_ptr_t p);
+
+/**
+ * Wrapper of c2_dump_raw().
+ */
+static inline void
+c2_dump(c2_ptr_t p) {
+ c2_dump_raw(p);
+ printf("\n");
+ fflush(stdout);
+}
+
+static Atom
+c2_get_atom_type(const c2_l_t *pleaf);
+
+static bool
+c2_match_once(session_t *ps, win *w, const c2_ptr_t cond);
+