reset

1 files changed, 0 insertions, 1674 deletions

diff --git a/src/c2.c b/src/c2.c
deleted file mode 100644
index 3500f7b..0000000
--- a/src/c2.c
+++ /dev/null
@@ -1,1674 +0,0 @@
-// SPDX-License-Identifier: MIT
-
-/*
- * Compton - a compositor for X11
- *
- * Based on `xcompmgr` - Copyright (c) 2003, Keith Packard
- *
- * Copyright (c) 2011-2013, Christopher Jeffrey
- * See LICENSE-mit for more information.
- *
- */
-
-#include <ctype.h>
-#include <fnmatch.h>
-#include <stdio.h>
-#include <string.h>
-
-// libpcre
-#ifdef CONFIG_REGEX_PCRE
-#include <pcre.h>
-
-// For compatibility 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
-
-#include <X11/Xlib.h>
-#include <xcb/xcb.h>
-
-#include "atom.h"
-#include "common.h"
-#include "compiler.h"
-#include "config.h"
-#include "log.h"
-#include "string_utils.h"
-#include "utils.h"
-#include "win.h"
-#include "x.h"
-
-#include "c2.h"
-
-#pragma GCC diagnostic error "-Wunused-parameter"
-
-#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, }
-
-static const 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;
-	xcb_atom_t tgtatom;
-	bool tgt_onframe;
-	int index;
-	enum { C2_L_PUNDEFINED = -1,
-	       C2_L_PID = 0,
-	       C2_L_PX,
-	       C2_L_PY,
-	       C2_L_PX2,
-	       C2_L_PY2,
-	       C2_L_PWIDTH,
-	       C2_L_PHEIGHT,
-	       C2_L_PWIDTHB,
-	       C2_L_PHEIGHTB,
-	       C2_L_PBDW,
-	       C2_L_PFULLSCREEN,
-	       C2_L_POVREDIR,
-	       C2_L_PARGB,
-	       C2_L_PFOCUSED,
-	       C2_L_PWMWIN,
-	       C2_L_PBSHAPED,
-	       C2_L_PROUNDED,
-	       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 = 0, .type = C2_L_TUNDEFINED,             \
-		.format = 0, .ptntype = C2_L_PTUNDEFINED, .ptnstr = NULL, .ptnint = 0,      \
-	}
-
-static const c2_l_t leaf_def = C2_L_INIT;
-
-/// Linked list type of conditions.
-struct _c2_lptr {
-	c2_ptr_t ptr;
-	void *data;
-	struct _c2_lptr *next;
-};
-
-/// Initializer for c2_lptr_t.
-#define C2_LPTR_INIT                                                                     \
-	{ .ptr = C2_PTR_INIT, .data = NULL, .next = NULL, }
-
-/// Structure representing a predefined target.
-typedef struct {
-	const char *name;
-	enum c2_l_type type;
-	int format;
-} c2_predef_t;
-
-// Predefined targets.
-static const c2_predef_t C2_PREDEFS[] = {
-    [C2_L_PID] = {"id", C2_L_TCARDINAL, 0},
-    [C2_L_PX] = {"x", C2_L_TCARDINAL, 0},
-    [C2_L_PY] = {"y", C2_L_TCARDINAL, 0},
-    [C2_L_PX2] = {"x2", C2_L_TCARDINAL, 0},
-    [C2_L_PY2] = {"y2", C2_L_TCARDINAL, 0},
-    [C2_L_PWIDTH] = {"width", C2_L_TCARDINAL, 0},
-    [C2_L_PHEIGHT] = {"height", C2_L_TCARDINAL, 0},
-    [C2_L_PWIDTHB] = {"widthb", C2_L_TCARDINAL, 0},
-    [C2_L_PHEIGHTB] = {"heightb", C2_L_TCARDINAL, 0},
-    [C2_L_PBDW] = {"border_width", C2_L_TCARDINAL, 0},
-    [C2_L_PFULLSCREEN] = {"fullscreen", C2_L_TCARDINAL, 0},
-    [C2_L_POVREDIR] = {"override_redirect", C2_L_TCARDINAL, 0},
-    [C2_L_PARGB] = {"argb", C2_L_TCARDINAL, 0},
-    [C2_L_PFOCUSED] = {"focused", C2_L_TCARDINAL, 0},
-    [C2_L_PWMWIN] = {"wmwin", C2_L_TCARDINAL, 0},
-    [C2_L_PBSHAPED] = {"bounding_shaped", C2_L_TCARDINAL, 0},
-    [C2_L_PROUNDED] = {"rounded_corners", 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},
-};
-
-/**
- * Get the numeric property value from a win_prop_t.
- */
-static inline long winprop_get_int(winprop_t prop, size_t index) {
-	long tgt = 0;
-
-	if (!prop.nitems || index >= prop.nitems) {
-		return 0;
-	}
-
-	switch (prop.format) {
-	case 8: tgt = *(prop.p8 + index); break;
-	case 16: tgt = *(prop.p16 + index); break;
-	case 32: tgt = *(prop.p32 + index); break;
-	default: assert(0); break;
-	}
-
-	return tgt;
-}
-
-/**
- * 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((unsigned char)c) || '_' == c)
-		return 1;
-	else
-		return 0;
-}
-
-/**
- * Return whether a c2_ptr_t is empty.
- */
-static inline attr_unused 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 = NULL};
-	p.b = cmalloc(c2_b_t);
-
-	p.b->neg = false;
-	p.b->op = op;
-	p.b->opr1 = p1;
-	p.b->opr2 = p2;
-
-	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(const char *pattern, int offset, c2_ptr_t *presult, int level);
-
-static int c2_parse_target(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(const char *pattern, int offset, c2_ptr_t *presult);
-
-static int c2_parse_legacy(const char *pattern, int offset, c2_ptr_t *presult);
-
-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 attr_unused c2_dump(c2_ptr_t p);
-
-static xcb_atom_t c2_get_atom_type(const c2_l_t *pleaf);
-
-static bool c2_match_once(session_t *ps, const struct managed_win *w, const c2_ptr_t cond);
-
-/**
- * Parse a condition string.
- */
-c2_lptr_t *c2_parse(c2_lptr_t **pcondlst, const char *pattern, void *data) {
-	if (!pattern)
-		return NULL;
-
-	// Parse the pattern
-	c2_ptr_t result = C2_PTR_INIT;
-	int offset = -1;
-
-	if (strlen(pattern) >= 2 && ':' == pattern[1])
-		offset = c2_parse_legacy(pattern, 0, &result);
-	else
-		offset = c2_parse_grp(pattern, 0, &result, 0);
-
-	if (offset < 0) {
-		c2_freep(&result);
-		return NULL;
-	}
-
-	// Insert to pcondlst
-	{
-		static const c2_lptr_t lptr_def = C2_LPTR_INIT;
-		auto plptr = cmalloc(c2_lptr_t);
-		memcpy(plptr, &lptr_def, sizeof(c2_lptr_t));
-		plptr->ptr = result;
-		plptr->data = data;
-		if (pcondlst) {
-			plptr->next = *pcondlst;
-			*pcondlst = plptr;
-		}
-
-#ifdef DEBUG_C2
-		log_trace("(\"%s\"): ", pattern);
-		c2_dump(plptr->ptr);
-		putchar('\n');
-#endif
-
-		return plptr;
-	}
-}
-
-#define c2_error(format, ...)                                                                \
-	do {                                                                                 \
-		log_error("Pattern \"%s\" pos %d: " format, pattern, offset, ##__VA_ARGS__); \
-		goto fail;                                                                   \
-	} while (0)
-
-// TODO(yshui) Not a very good macro, should probably be a function
-#define C2H_SKIP_SPACES()                                                                \
-	{                                                                                \
-		while (isspace((unsigned char)pattern[offset]))                          \
-			++offset;                                                        \
-	}
-
-/**
- * Parse a group in condition string.
- *
- * @return offset of next character in string
- */
-static int c2_parse_grp(const char *pattern, int offset, c2_ptr_t *presult, int level) {
-	// Check for recursion levels
-	if (level > C2_MAX_LEVELS)
-		c2_error("Exceeded maximum recursion levels.");
-
-	if (!pattern)
-		return -1;
-
-	// Expected end character
-	const char endchar = (offset ? ')' : '\0');
-
-	// We use a system that a maximum of 2 elements are kept. When we find
-	// the third element, we combine the elements according to operator
-	// precedence. This design limits operators to have at most two-levels
-	// of precedence and fixed left-to-right associativity.
-
-	// For storing branch operators. ops[0] is actually unused
-	c2_b_op_t ops[3] = {};
-	// For storing elements
-	c2_ptr_t eles[2] = {C2_PTR_INIT, C2_PTR_INIT};
-	// Index of next free element slot in eles
-	int elei = 0;
-	// Pointer to the position of next element
-	c2_ptr_t *pele = eles;
-	// Negation flag of next operator
-	bool neg = false;
-	// Whether we are expecting an element immediately, is true at first, or
-	// after encountering a logical operator
-	bool next_expected = true;
-
-	// Parse the pattern character-by-character
-	for (; pattern[offset]; ++offset) {
-		assert(elei <= 2);
-
-		// Jump over spaces
-		if (isspace((unsigned char)pattern[offset]))
-			continue;
-
-		// Handle end of group
-		if (')' == pattern[offset])
-			break;
-
-		// Handle "!"
-		if ('!' == pattern[offset]) {
-			if (!next_expected)
-				c2_error("Unexpected \"!\".");
-
-			neg = !neg;
-			continue;
-		}
-
-		// Handle AND and OR
-		if ('&' == pattern[offset] || '|' == pattern[offset]) {
-			if (next_expected)
-				c2_error("Unexpected logical operator.");
-
-			next_expected = true;
-			if (!mstrncmp("&&", pattern + offset)) {
-				ops[elei] = C2_B_OAND;
-				++offset;
-			} else if (!mstrncmp("||", pattern + offset)) {
-				ops[elei] = C2_B_OOR;
-				++offset;
-			} else
-				c2_error("Illegal logical operator.");
-
-			continue;
-		}
-
-		// Parsing an element
-		if (!next_expected)
-			c2_error("Unexpected expression.");
-
-		assert(!elei || ops[elei]);
-
-		// If we are out of space
-		if (2 == elei) {
-			--elei;
-			// If the first operator has higher or equal precedence, combine
-			// the first two elements
-			if (c2h_b_opcmp(ops[1], ops[2]) >= 0) {
-				eles[0] = c2h_comb_tree(ops[1], eles[0], eles[1]);
-				c2_ptr_reset(&eles[1]);
-				pele = &eles[elei];
-				ops[1] = ops[2];
-			}
-			// Otherwise, combine the second and the incoming one
-			else {
-				eles[1] = c2h_comb_tree(ops[2], eles[1], C2_PTR_NULL);
-				assert(eles[1].isbranch);
-				pele = &eles[1].b->opr2;
-			}
-			// The last operator always needs to be reset
-			ops[2] = C2_B_OUNDEFINED;
-		}
-
-		// It's a subgroup if it starts with '('
-		if ('(' == pattern[offset]) {
-			if ((offset = c2_parse_grp(pattern, offset + 1, pele, level + 1)) < 0)
-				goto fail;
-		}
-		// Otherwise it's a leaf
-		else {
-			if ((offset = c2_parse_target(pattern, offset, pele)) < 0)
-				goto fail;
-
-			assert(!pele->isbranch && !c2_ptr_isempty(*pele));
-
-			if ((offset = c2_parse_op(pattern, offset, pele)) < 0)
-				goto fail;
-
-			if ((offset = c2_parse_pattern(pattern, offset, pele)) < 0)
-				goto fail;
-		}
-		// Decrement offset -- we will increment it in loop update
-		--offset;
-
-		// Apply negation
-		if (neg) {
-			neg = false;
-			if (pele->isbranch)
-				pele->b->neg = !pele->b->neg;
-			else
-				pele->l->neg = !pele->l->neg;
-		}
-
-		next_expected = false;
-		++elei;
-		pele = &eles[elei];
-	}
-
-	// Wrong end character?
-	if (pattern[offset] && !endchar)
-		c2_error("Expected end of string but found '%c'.", pattern[offset]);
-	if (!pattern[offset] && endchar)
-		c2_error("Expected '%c' but found end of string.", endchar);
-
-	// Handle end of group
-	if (!elei) {
-		c2_error("Empty group.");
-	} else if (next_expected) {
-		c2_error("Missing rule before end of group.");
-	} else if (elei > 1) {
-		assert(2 == elei);
-		assert(ops[1]);
-		eles[0] = c2h_comb_tree(ops[1], eles[0], eles[1]);
-		c2_ptr_reset(&eles[1]);
-	}
-
-	*presult = eles[0];
-
-	if (')' == pattern[offset])
-		++offset;
-
-	return offset;
-
-fail:
-	c2_freep(&eles[0]);
-	c2_freep(&eles[1]);
-
-	return -1;
-}
-
-/**
- * Parse the target part of a rule.
- */
-static int c2_parse_target(const char *pattern, int offset, c2_ptr_t *presult) {
-	// Initialize leaf
-	presult->isbranch = false;
-	presult->l = cmalloc(c2_l_t);
-
-	c2_l_t *const pleaf = presult->l;
-	memcpy(pleaf, &leaf_def, sizeof(c2_l_t));
-
-	// Parse negation marks
-	while ('!' == pattern[offset]) {
-		pleaf->neg = !pleaf->neg;
-		++offset;
-		C2H_SKIP_SPACES();
-	}
-
-	// Copy target name out
-	int tgtlen = 0;
-	for (; pattern[offset] &&
-	       (isalnum((unsigned char)pattern[offset]) || '_' == pattern[offset]);
-	     ++offset) {
-		++tgtlen;
-	}
-	if (!tgtlen) {
-		c2_error("Empty target.");
-	}
-	pleaf->tgt = strndup(&pattern[offset - tgtlen], (size_t)tgtlen);
-
-	// Check for predefined targets
-	static const int npredefs = (int)(sizeof(C2_PREDEFS) / sizeof(C2_PREDEFS[0]));
-	for (int i = 0; i < npredefs; ++i) {
-		if (!strcmp(C2_PREDEFS[i].name, pleaf->tgt)) {
-			pleaf->predef = i;
-			pleaf->type = C2_PREDEFS[i].type;
-			pleaf->format = C2_PREDEFS[i].format;
-			break;
-		}
-	}
-
-	C2H_SKIP_SPACES();
-
-	// Parse target-on-frame flag
-	if ('@' == pattern[offset]) {
-		pleaf->tgt_onframe = true;
-		++offset;
-		C2H_SKIP_SPACES();
-	}
-
-	// Parse index
-	if ('[' == pattern[offset]) {
-		if (pleaf->predef != C2_L_PUNDEFINED) {
-			c2_error("Predefined targets can't have index.");
-		}
-
-		offset++;
-
-		C2H_SKIP_SPACES();
-
-		long index = -1;
-		const char *endptr = NULL;
-
-		if ('*' == pattern[offset]) {
-			index = -1;
-			endptr = pattern + offset + 1;
-		} else {
-			index = strtol(pattern + offset, (char **)&endptr, 0);
-			if (index < 0) {
-				c2_error("Index number invalid.");
-			}
-		}
-
-		if (!endptr || pattern + offset == endptr) {
-			c2_error("No index number found after bracket.");
-		}
-
-		pleaf->index = to_int_checked(index);
-		offset = to_int_checked(endptr - pattern);
-
-		C2H_SKIP_SPACES();
-
-		if (pattern[offset] != ']') {
-			c2_error("Index end marker not found.");
-		}
-
-		++offset;
-
-		C2H_SKIP_SPACES();
-	}
-
-	// Parse target type and format
-	if (':' == pattern[offset]) {
-		++offset;
-		C2H_SKIP_SPACES();
-
-		// Look for format
-		bool hasformat = false;
-		long format = 0;
-		{
-			char *endptr = NULL;
-			format = strtol(pattern + offset, &endptr, 0);
-			assert(endptr);
-			if ((hasformat = (endptr && endptr != pattern + offset))) {
-				offset = to_int_checked(endptr - pattern);
-			}
-			C2H_SKIP_SPACES();
-		}
-
-		// Look for type
-		enum c2_l_type type = C2_L_TUNDEFINED;
-		switch (pattern[offset]) {
-		case 'w': type = C2_L_TWINDOW; break;
-		case 'd': type = C2_L_TDRAWABLE; break;
-		case 'c': type = C2_L_TCARDINAL; break;
-		case 's': type = C2_L_TSTRING; break;
-		case 'a': type = C2_L_TATOM; break;
-		default: c2_error("Invalid type character.");
-		}
-
-		if (type) {
-			if (pleaf->predef != C2_L_PUNDEFINED) {
-				log_warn("Type specified for a default target "
-				         "will be ignored.");
-			} else {
-				if (pleaf->type && type != pleaf->type) {
-					log_warn("Default type overridden on "
-					         "target.");
-				}
-				pleaf->type = type;
-			}
-		}
-
-		offset++;
-		C2H_SKIP_SPACES();
-
-		// Default format
-		if (!pleaf->format) {
-			switch (pleaf->type) {
-			case C2_L_TWINDOW:
-			case C2_L_TDRAWABLE:
-			case C2_L_TATOM: pleaf->format = 32; break;
-			case C2_L_TSTRING: pleaf->format = 8; break;
-			default: break;
-			}
-		}
-
-		// Write format
-		if (hasformat) {
-			if (pleaf->predef != C2_L_PUNDEFINED) {
-				log_warn("Format \"%ld\" specified on a default target "
-				         "will be ignored.",
-				         format);
-			} else if (pleaf->type == C2_L_TSTRING) {
-				log_warn("Format \"%ld\" specified on a string target "
-				         "will be ignored.",
-				         format);
-			} else {
-				if (pleaf->format && pleaf->format != format) {
-					log_warn("Default format %d overridden on "
-					         "target.",
-					         pleaf->format);
-				}
-				pleaf->format = to_int_checked(format);
-			}
-		}
-	}
-
-	if (!pleaf->type) {
-		c2_error("Target type cannot be determined.");
-	}
-
-	// if (!pleaf->predef && !pleaf->format && C2_L_TSTRING != pleaf->type)
-	//   c2_error("Target format cannot be determined.");
-
-	if (pleaf->format && 8 != pleaf->format && 16 != pleaf->format && 32 != pleaf->format) {
-		c2_error("Invalid format.");
-	}
-
-	return offset;
-
-fail:
-	return -1;
-}
-
-/**
- * Parse the operator part of a leaf.
- */
-static int c2_parse_op(const char *pattern, int offset, c2_ptr_t *presult) {
-	c2_l_t *const pleaf = presult->l;
-
-	// Parse negation marks
-	C2H_SKIP_SPACES();
-	while ('!' == pattern[offset]) {
-		pleaf->neg = !pleaf->neg;
-		++offset;
-		C2H_SKIP_SPACES();
-	}
-
-	// Parse qualifiers
-	if ('*' == pattern[offset] || '^' == pattern[offset] || '%' == pattern[offset] ||
-	    '~' == pattern[offset]) {
-		switch (pattern[offset]) {
-		case '*': pleaf->match = C2_L_MCONTAINS; break;
-		case '^': pleaf->match = C2_L_MSTART; break;
-		case '%': pleaf->match = C2_L_MWILDCARD; break;
-		case '~': pleaf->match = C2_L_MPCRE; break;
-		default: assert(0);
-		}
-		++offset;
-		C2H_SKIP_SPACES();
-	}
-
-	// Parse flags
-	while ('?' == pattern[offset]) {
-		pleaf->match_ignorecase = true;
-		++offset;
-		C2H_SKIP_SPACES();
-	}
-
-	// Parse operator
-	while ('=' == pattern[offset] || '>' == pattern[offset] || '<' == pattern[offset]) {
-		if ('=' == pattern[offset] && C2_L_OGT == pleaf->op)
-			pleaf->op = C2_L_OGTEQ;
-		else if ('=' == pattern[offset] && C2_L_OLT == pleaf->op)
-			pleaf->op = C2_L_OLTEQ;
-		else if (pleaf->op) {
-			c2_error("Duplicate operator.");
-		} else {
-			switch (pattern[offset]) {
-			case '=': pleaf->op = C2_L_OEQ; break;
-			case '>': pleaf->op = C2_L_OGT; break;
-			case '<': pleaf->op = C2_L_OLT; break;
-			default: assert(0);
-			}
-		}
-		++offset;
-		C2H_SKIP_SPACES();
-	}
-
-	// Check for problems
-	if (C2_L_OEQ != pleaf->op && (pleaf->match || pleaf->match_ignorecase))
-		c2_error("Exists/greater-than/less-than operators cannot have a "
-		         "qualifier.");
-
-	return offset;
-
-fail:
-	return -1;
-}
-
-/**
- * Parse the pattern part of a leaf.
- */
-static int c2_parse_pattern(const char *pattern, int offset, c2_ptr_t *presult) {
-	c2_l_t *const pleaf = presult->l;
-
-	// Exists operator cannot have pattern
-	if (!pleaf->op) {
-		return offset;
-	}
-
-	C2H_SKIP_SPACES();
-
-	char *endptr = NULL;
-	if (!strcmp_wd("true", &pattern[offset])) {
-		pleaf->ptntype = C2_L_PTINT;
-		pleaf->ptnint = true;
-		offset += 4;        // length of "true";
-	} else if (!strcmp_wd("false", &pattern[offset])) {
-		pleaf->ptntype = C2_L_PTINT;
-		pleaf->ptnint = false;
-		offset += 5;        // length of "false";
-	} else if (pleaf->ptnint = strtol(pattern + offset, &endptr, 0),
-	           pattern + offset != endptr) {
-		pleaf->ptntype = C2_L_PTINT;
-		offset = to_int_checked(endptr - pattern);
-		// Make sure we are stopping at the end of a word
-		if (isalnum((unsigned char)pattern[offset])) {
-			c2_error("Trailing characters after a numeric pattern.");
-		}
-	} else {
-		// Parse string patterns
-		bool raw = false;
-		char delim = '\0';
-
-		// String flags
-		if (tolower((unsigned char)pattern[offset]) == 'r') {
-			raw = true;
-			++offset;
-			C2H_SKIP_SPACES();
-		}
-
-		// Check for delimiters
-		if (pattern[offset] == '\"' || pattern[offset] == '\'') {
-			pleaf->ptntype = C2_L_PTSTRING;
-			delim = pattern[offset];
-			++offset;
-		}
-
-		if (pleaf->ptntype != C2_L_PTSTRING) {
-			c2_error("Invalid pattern type.");
-		}
-
-		// Parse the string now
-		// We can't determine the length of the pattern, so we use the length
-		// to the end of the pattern string -- currently escape sequences
-		// cannot be converted to a string longer than itself.
-		auto tptnstr = ccalloc((strlen(pattern + offset) + 1), char);
-		char *ptptnstr = tptnstr;
-		pleaf->ptnstr = tptnstr;
-		for (; pattern[offset] && delim != pattern[offset]; ++offset) {
-			// Handle escape sequences if it's not a raw string
-			if ('\\' == pattern[offset] && !raw) {
-				switch (pattern[++offset]) {
-				case '\\': *(ptptnstr++) = '\\'; break;
-				case '\'': *(ptptnstr++) = '\''; break;
-				case '\"': *(ptptnstr++) = '\"'; break;
-				case 'a': *(ptptnstr++) = '\a'; break;
-				case 'b': *(ptptnstr++) = '\b'; break;
-				case 'f': *(ptptnstr++) = '\f'; break;
-				case 'n': *(ptptnstr++) = '\n'; break;
-				case 'r': *(ptptnstr++) = '\r'; break;
-				case 't': *(ptptnstr++) = '\t'; break;
-				case 'v': *(ptptnstr++) = '\v'; break;
-				case 'o':
-				case 'x': {
-					char *tstr = strndup(pattern + offset + 1, 2);
-					char *pstr = NULL;
-					long val = strtol(
-					    tstr, &pstr, ('o' == pattern[offset] ? 8 : 16));
-					free(tstr);
-					if (pstr != &tstr[2] || val <= 0)
-						c2_error("Invalid octal/hex escape "
-						         "sequence.");
-					*(ptptnstr++) = to_char_checked(val);
-					offset += 2;
-					break;
-				}
-				default: c2_error("Invalid escape sequence.");
-				}
-			} else {
-				*(ptptnstr++) = pattern[offset];
-			}
-		}
-		if (!pattern[offset])
-			c2_error("Premature end of pattern string.");
-		++offset;
-		*ptptnstr = '\0';
-		pleaf->ptnstr = strdup(tptnstr);
-		free(tptnstr);
-	}
-
-	C2H_SKIP_SPACES();
-
-	if (!pleaf->ptntype)
-		c2_error("Invalid pattern type.");
-
-	// Check if the type is correct
-	if (!(((C2_L_TSTRING == pleaf->type || C2_L_TATOM == pleaf->type) &&
-	       C2_L_PTSTRING == pleaf->ptntype) ||
-	      ((C2_L_TCARDINAL == pleaf->type || C2_L_TWINDOW == pleaf->type ||
-	        C2_L_TDRAWABLE == pleaf->type) &&
-	       C2_L_PTINT == pleaf->ptntype)))
-		c2_error("Pattern type incompatible with target type.");
-
-	if (C2_L_PTINT == pleaf->ptntype && pleaf->match)
-		c2_error("Integer/boolean pattern cannot have operator qualifiers.");
-
-	if (C2_L_PTINT == pleaf->ptntype && pleaf->match_ignorecase)
-		c2_error("Integer/boolean pattern cannot have flags.");
-
-	if (C2_L_PTSTRING == pleaf->ptntype &&
-	    (C2_L_OGT == pleaf->op || C2_L_OGTEQ == pleaf->op || C2_L_OLT == pleaf->op ||
-	     C2_L_OLTEQ == pleaf->op))
-		c2_error("String pattern cannot have an arithmetic operator.");
-
-	return offset;
-
-fail:
-	return -1;
-}
-
-/**
- * Parse a condition with legacy syntax.
- */
-static int c2_parse_legacy(const char *pattern, int offset, c2_ptr_t *presult) {
-	if (strlen(pattern + offset) < 4 || pattern[offset + 1] != ':' ||
-	    !strchr(pattern + offset + 2, ':')) {
-		c2_error("Legacy parser: Invalid format.");
-	}
-
-	// Allocate memory for new leaf
-	auto pleaf = cmalloc(c2_l_t);
-	presult->isbranch = false;
-	presult->l = pleaf;
-	memcpy(pleaf, &leaf_def, sizeof(c2_l_t));
-	pleaf->type = C2_L_TSTRING;
-	pleaf->op = C2_L_OEQ;
-	pleaf->ptntype = C2_L_PTSTRING;
-
-	// Determine the pattern target
-#define TGTFILL(pdefid)                                                                  \
-	(pleaf->predef = pdefid, pleaf->type = C2_PREDEFS[pdefid].type,                  \
-	 pleaf->format = C2_PREDEFS[pdefid].format)
-	switch (pattern[offset]) {
-	case 'n': TGTFILL(C2_L_PNAME); break;
-	case 'i': TGTFILL(C2_L_PCLASSI); break;
-	case 'g': TGTFILL(C2_L_PCLASSG); break;
-	case 'r': TGTFILL(C2_L_PROLE); break;
-	default: c2_error("Target \"%c\" invalid.\n", pattern[offset]);
-	}
-#undef TGTFILL
-
-	offset += 2;
-
-	// Determine the match type
-	switch (pattern[offset]) {
-	case 'e': pleaf->match = C2_L_MEXACT; break;
-	case 'a': pleaf->match = C2_L_MCONTAINS; break;
-	case 's': pleaf->match = C2_L_MSTART; break;
-	case 'w': pleaf->match = C2_L_MWILDCARD; break;
-	case 'p': pleaf->match = C2_L_MPCRE; break;
-	default: c2_error("Type \"%c\" invalid.\n", pattern[offset]);
-	}
-	++offset;
-
-	// Determine the pattern flags
-	while (':' != pattern[offset]) {
-		switch (pattern[offset]) {
-		case 'i': pleaf->match_ignorecase = true; break;
-		default: c2_error("Flag \"%c\" invalid.", pattern[offset]);
-		}
-		++offset;
-	}
-	++offset;
-
-	// Copy the pattern
-	pleaf->ptnstr = strdup(pattern + offset);
-
-	return offset;
-
-fail:
-	return -1;
-}
-
-#undef c2_error
-
-/**
- * Do postprocessing on a condition leaf.
- */
-static bool c2_l_postprocess(session_t *ps, c2_l_t *pleaf) {
-	// Give a pattern type to a leaf with exists operator, if needed
-	if (C2_L_OEXISTS == pleaf->op && !pleaf->ptntype) {
-		pleaf->ptntype = (C2_L_TSTRING == pleaf->type ? C2_L_PTSTRING : C2_L_PTINT);
-	}
-
-	// Get target atom if it's not a predefined one
-	if (pleaf->predef == C2_L_PUNDEFINED) {
-		pleaf->tgtatom = get_atom(ps->atoms, pleaf->tgt);
-		if (!pleaf->tgtatom) {
-			log_error("Failed to get atom for target \"%s\".", pleaf->tgt);
-			return false;
-		}
-	}
-
-	// Insert target Atom into atom track list
-	if (pleaf->tgtatom) {
-		bool found = false;
-		for (latom_t *platom = ps->track_atom_lst; platom; platom = platom->next) {
-			if (pleaf->tgtatom == platom->atom) {
-				found = true;
-				break;
-			}
-		}
-		if (!found) {
-			auto pnew = cmalloc(latom_t);
-			pnew->next = ps->track_atom_lst;
-			pnew->atom = pleaf->tgtatom;
-			ps->track_atom_lst = pnew;
-		}
-	}
-
-	// Warn about lower case characters in target name
-	if (pleaf->predef == C2_L_PUNDEFINED) {
-		for (const char *pc = pleaf->tgt; *pc; ++pc) {
-			if (islower((unsigned char)*pc)) {
-				log_warn("Lowercase character in target name \"%s\".",
-				         pleaf->tgt);
-				break;
-			}
-		}
-	}
-
-	// PCRE patterns
-	if (C2_L_PTSTRING == pleaf->ptntype && C2_L_MPCRE == pleaf->match) {
-#ifdef CONFIG_REGEX_PCRE
-		const char *error = NULL;
-		int erroffset = 0;
-		int options = 0;
-
-		// Ignore case flag
-		if (pleaf->match_ignorecase)
-			options |= PCRE_CASELESS;
-
-		// Compile PCRE expression
-		pleaf->regex_pcre =
-		    pcre_compile(pleaf->ptnstr, options, &error, &erroffset, NULL);
-		if (!pleaf->regex_pcre) {
-			log_error("Pattern \"%s\": PCRE regular expression parsing "
-			          "failed on "
-			          "offset %d: %s",
-			          pleaf->ptnstr, erroffset, error);
-			return false;
-		}
-#ifdef CONFIG_REGEX_PCRE_JIT
-		pleaf->regex_pcre_extra =
-		    pcre_study(pleaf->regex_pcre, PCRE_STUDY_JIT_COMPILE, &error);
-		if (!pleaf->regex_pcre_extra) {
-			printf("Pattern \"%s\": PCRE regular expression study failed: %s",
-			       pleaf->ptnstr, error);
-		}
-#endif
-
-		// Free the target string
-		// free(pleaf->tgt);
-		// pleaf->tgt = NULL;
-#else
-		log_error("PCRE regular expression support not compiled in.");
-		return false;
-#endif
-	}
-
-	return true;
-}
-
-static bool c2_tree_postprocess(session_t *ps, c2_ptr_t node) {
-	if (!node.isbranch) {
-		return c2_l_postprocess(ps, node.l);
-	}
-	if (!c2_tree_postprocess(ps, node.b->opr1))
-		return false;
-	return c2_tree_postprocess(ps, node.b->opr2);
-}
-
-bool c2_list_postprocess(session_t *ps, c2_lptr_t *list) {
-	c2_lptr_t *head = list;
-	while (head) {
-		if (!c2_tree_postprocess(ps, head->ptr))
-			return false;
-		head = head->next;
-	}
-	return true;
-}
-/**
- * Free a condition tree.
- */
-static void c2_free(c2_ptr_t p) {
-	// For a branch element
-	if (p.isbranch) {
-		c2_b_t *const pbranch = p.b;
-
-		if (!pbranch)
-			return;
-
-		c2_free(pbranch->opr1);
-		c2_free(pbranch->opr2);
-		free(pbranch);
-	}
-	// For a leaf element
-	else {
-		c2_l_t *const pleaf = p.l;
-
-		if (!pleaf)
-			return;
-
-		free(pleaf->tgt);
-		free(pleaf->ptnstr);
-#ifdef CONFIG_REGEX_PCRE
-		pcre_free(pleaf->regex_pcre);
-		LPCRE_FREE_STUDY(pleaf->regex_pcre_extra);
-#endif
-		free(pleaf);
-	}
-}
-
-/**
- * Free a condition tree in c2_lptr_t.
- */
-c2_lptr_t *c2_free_lptr(c2_lptr_t *lp) {
-	if (!lp)
-		return NULL;
-
-	c2_lptr_t *pnext = lp->next;
-	c2_free(lp->ptr);
-	free(lp);
-
-	return pnext;
-}
-
-/**
- * Get a string representation of a rule target.
- */
-static const char *c2h_dump_str_tgt(const c2_l_t *pleaf) {
-	if (pleaf->predef != C2_L_PUNDEFINED) {
-		return C2_PREDEFS[pleaf->predef].name;
-	} else {
-		return pleaf->tgt;
-	}
-}
-
-/**
- * Get a string representation of a target.
- */
-static const char *c2h_dump_str_type(const c2_l_t *pleaf) {
-	switch (pleaf->type) {
-	case C2_L_TWINDOW: return "w";
-	case C2_L_TDRAWABLE: return "d";
-	case C2_L_TCARDINAL: return "c";
-	case C2_L_TSTRING: return "s";
-	case C2_L_TATOM: return "a";
-	case C2_L_TUNDEFINED: break;
-	}
-
-	return NULL;
-}
-
-/**
- * Dump a condition tree.
- */
-static void c2_dump(c2_ptr_t p) {
-	// For a branch
-	if (p.isbranch) {
-		const c2_b_t *const pbranch = p.b;
-
-		if (!pbranch) {
-			return;
-		}
-
-		if (pbranch->neg) {
-			putchar('!');
-		}
-
-		printf("(");
-		c2_dump(pbranch->opr1);
-
-		switch (pbranch->op) {
-		case C2_B_OAND: printf(" && "); break;
-		case C2_B_OOR: printf(" || "); break;
-		case C2_B_OXOR: printf(" XOR "); break;
-		default: assert(0); break;
-		}
-
-		c2_dump(pbranch->opr2);
-		printf(") ");
-	}
-	// For a leaf
-	else {
-		const c2_l_t *const pleaf = p.l;
-
-		if (!pleaf) {
-			return;
-		}
-
-		if (C2_L_OEXISTS == pleaf->op && pleaf->neg) {
-			putchar('!');
-		}
-
-		// Print target name, type, and format
-		{
-			printf("%s", c2h_dump_str_tgt(pleaf));
-			if (pleaf->tgt_onframe) {
-				putchar('@');
-			}
-			if (pleaf->predef == C2_L_PUNDEFINED) {
-				if (pleaf->index < 0) {
-					printf("[*]");
-				} else {
-					printf("[%d]", pleaf->index);
-				}
-			}
-			printf(":%d%s", pleaf->format, c2h_dump_str_type(pleaf));
-		}
-
-		// Print operator
-		putchar(' ');
-
-		if (C2_L_OEXISTS != pleaf->op && pleaf->neg) {
-			putchar('!');
-		}
-
-		switch (pleaf->match) {
-		case C2_L_MEXACT: break;
-		case C2_L_MCONTAINS: putchar('*'); break;
-		case C2_L_MSTART: putchar('^'); break;
-		case C2_L_MPCRE: putchar('~'); break;
-		case C2_L_MWILDCARD: putchar('%'); break;
-		}
-
-		if (pleaf->match_ignorecase) {
-			putchar('?');
-		}
-
-		switch (pleaf->op) {
-		case C2_L_OEXISTS: break;
-		case C2_L_OEQ: fputs("=", stdout); break;
-		case C2_L_OGT: fputs(">", stdout); break;
-		case C2_L_OGTEQ: fputs(">=", stdout); break;
-		case C2_L_OLT: fputs("<", stdout); break;
-		case C2_L_OLTEQ: fputs("<=", stdout); break;
-		}
-
-		if (C2_L_OEXISTS == pleaf->op) {
-			return;
-		}
-
-		// Print pattern
-		putchar(' ');
-		switch (pleaf->ptntype) {
-		case C2_L_PTINT: printf("%ld", pleaf->ptnint); break;
-		case C2_L_PTSTRING:
-			// TODO(yshui) Escape string before printing out?
-			printf("\"%s\"", pleaf->ptnstr);
-			break;
-		default: assert(0); break;
-		}
-	}
-}
-
-/**
- * Get the type atom of a condition.
- */
-static xcb_atom_t c2_get_atom_type(const c2_l_t *pleaf) {
-	switch (pleaf->type) {
-	case C2_L_TCARDINAL: return XCB_ATOM_CARDINAL;
-	case C2_L_TWINDOW: return XCB_ATOM_WINDOW;
-	case C2_L_TSTRING: return XCB_ATOM_STRING;
-	case C2_L_TATOM: return XCB_ATOM_ATOM;
-	case C2_L_TDRAWABLE: return XCB_ATOM_DRAWABLE;
-	default: assert(0); break;
-	}
-	unreachable;
-}
-
-/**
- * Match a window against a single leaf window condition.
- *
- * For internal use.
- */
-static inline void c2_match_once_leaf(session_t *ps, const struct managed_win *w,
-                                      const c2_l_t *pleaf, bool *pres, bool *perr) {
-	assert(pleaf);
-
-	const xcb_window_t wid = (pleaf->tgt_onframe ? w->client_win : w->base.id);
-
-	// Return if wid is missing
-	if (pleaf->predef == C2_L_PUNDEFINED && !wid) {
-		return;
-	}
-
-	const int idx = (pleaf->index < 0 ? 0 : pleaf->index);
-
-	switch (pleaf->ptntype) {
-	// Deal with integer patterns
-	case C2_L_PTINT: {
-		long *targets = NULL;
-		long *targets_free = NULL;
-		size_t ntargets = 0;
-
-		// Get the value
-		// A predefined target
-		long predef_target = 0;
-		if (pleaf->predef != C2_L_PUNDEFINED) {
-			*perr = false;
-			switch (pleaf->predef) {
-			case C2_L_PID: predef_target = wid; break;
-			case C2_L_PX: predef_target = w->g.x; break;
-			case C2_L_PY: predef_target = w->g.y; break;
-			case C2_L_PX2: predef_target = w->g.x + w->widthb; break;
-			case C2_L_PY2: predef_target = w->g.y + w->heightb; break;
-			case C2_L_PWIDTH: predef_target = w->g.width; break;
-			case C2_L_PHEIGHT: predef_target = w->g.height; break;
-			case C2_L_PWIDTHB: predef_target = w->widthb; break;
-			case C2_L_PHEIGHTB: predef_target = w->heightb; break;
-			case C2_L_PBDW: predef_target = w->g.border_width; break;
-			case C2_L_PFULLSCREEN:
-				predef_target = win_is_fullscreen(ps, w);
-				break;
-			case C2_L_POVREDIR: predef_target = w->a.override_redirect; break;
-			case C2_L_PARGB: predef_target = win_has_alpha(w); break;
-			case C2_L_PFOCUSED:
-				predef_target = win_is_focused_raw(ps, w);
-				break;
-			case C2_L_PWMWIN: predef_target = w->wmwin; break;
-			case C2_L_PBSHAPED: predef_target = w->bounding_shaped; break;
-			case C2_L_PROUNDED: predef_target = w->rounded_corners; break;
-			case C2_L_PCLIENT: predef_target = w->client_win; break;
-			case C2_L_PLEADER: predef_target = w->leader; break;
-			default:
-				*perr = true;
-				assert(0);
-				break;
-			}
-			ntargets = 1;
-			targets = &predef_target;
-		}
-		// A raw window property
-		else {
-			int word_count = 1;
-			if (pleaf->index < 0) {
-				// Get length of property in 32-bit multiples
-				auto prop_info = x_get_prop_info(ps->c, wid, pleaf->tgtatom);
-				word_count = to_int_checked((prop_info.length + 4 - 1) / 4);
-			}
-			winprop_t prop = x_get_prop_with_offset(
-			    ps->c, wid, pleaf->tgtatom, idx, word_count,
-			    c2_get_atom_type(pleaf), pleaf->format);
-
-			ntargets = (pleaf->index < 0 ? prop.nitems : min2(prop.nitems, 1));
-			if (ntargets > 0) {
-				targets = targets_free = ccalloc(ntargets, long);
-				*perr = false;
-				for (size_t i = 0; i < ntargets; ++i) {
-					targets[i] = winprop_get_int(prop, i);
-				}
-			}
-			free_winprop(&prop);
-		}
-
-		if (*perr) {
-			goto fail_int;
-		}
-
-		// Do comparison
-		bool res = false;
-		for (size_t i = 0; i < ntargets; ++i) {
-			long tgt = targets[i];
-			switch (pleaf->op) {
-			case C2_L_OEXISTS:
-				res = (pleaf->predef != C2_L_PUNDEFINED ? tgt : true);
-				break;
-			case C2_L_OEQ: res = (tgt == pleaf->ptnint); break;
-			case C2_L_OGT: res = (tgt > pleaf->ptnint); break;
-			case C2_L_OGTEQ: res = (tgt >= pleaf->ptnint); break;
-			case C2_L_OLT: res = (tgt < pleaf->ptnint); break;
-			case C2_L_OLTEQ: res = (tgt <= pleaf->ptnint); break;
-			default: *perr = true; assert(0);
-			}
-			if (res) {
-				break;
-			}
-		}
-		*pres = res;
-
-	fail_int:
-		// Free property values after usage, if necessary
-		if (targets_free) {
-			free(targets_free);
-		}
-	} break;
-	// String patterns
-	case C2_L_PTSTRING: {
-		const char **targets = NULL;
-		const char **targets_free = NULL;
-		const char **targets_free_inner = NULL;
-		size_t ntargets = 0;
-
-		// A predefined target
-		const char *predef_target = NULL;
-		if (pleaf->predef != C2_L_PUNDEFINED) {
-			switch (pleaf->predef) {
-			case C2_L_PWINDOWTYPE:
-				predef_target = WINTYPES[w->window_type];
-				break;
-			case C2_L_PNAME: predef_target = w->name; break;
-			case C2_L_PCLASSG: predef_target = w->class_general; break;
-			case C2_L_PCLASSI: predef_target = w->class_instance; break;
-			case C2_L_PROLE: predef_target = w->role; break;
-			default: assert(0); break;
-			}
-			ntargets = 1;
-			targets = &predef_target;
-		}
-		// An atom type property, convert it to string
-		else if (pleaf->type == C2_L_TATOM) {
-			int word_count = 1;
-			if (pleaf->index < 0) {
-				// Get length of property in 32-bit multiples
-				auto prop_info = x_get_prop_info(ps->c, wid, pleaf->tgtatom);
-				word_count = to_int_checked((prop_info.length + 4 - 1) / 4);
-			}
-			winprop_t prop = x_get_prop_with_offset(
-			    ps->c, wid, pleaf->tgtatom, idx, word_count,
-			    c2_get_atom_type(pleaf), pleaf->format);
-
-			ntargets = (pleaf->index < 0 ? prop.nitems : min2(prop.nitems, 1));
-			targets = targets_free = (const char **)ccalloc(2 * ntargets, char *);
-			targets_free_inner = targets + ntargets;
-
-			for (size_t i = 0; i < ntargets; ++i) {
-				xcb_atom_t atom = (xcb_atom_t)winprop_get_int(prop, i);
-				if (atom) {
-					xcb_get_atom_name_reply_t *reply = xcb_get_atom_name_reply(
-					    ps->c, xcb_get_atom_name(ps->c, atom), NULL);
-					if (reply) {
-						targets[i] = targets_free_inner[i] = strndup(
-						    xcb_get_atom_name_name(reply),
-						    (size_t)xcb_get_atom_name_name_length(reply));
-						free(reply);
-					}
-				}
-			}
-			free_winprop(&prop);
-		}
-		// Not an atom type, just fetch the string list
-		else {
-			char **strlst = NULL;
-			int nstr = 0;
-			if (wid_get_text_prop(ps, wid, pleaf->tgtatom, &strlst, &nstr)) {
-				if (pleaf->index < 0 && nstr > 0 && strlen(strlst[0]) > 0) {
-					ntargets = to_u32_checked(nstr);
-					targets = (const char **)strlst;
-				} else if (nstr > idx) {
-					ntargets = 1;
-					targets = (const char **)strlst + idx;
-				}
-			}
-			if (strlst) {
-				targets_free = (const char **)strlst;
-			}
-		}
-
-		if (ntargets == 0) {
-			goto fail_str;
-		}
-		for (size_t i = 0; i < ntargets; ++i) {
-			if (!targets[i]) {
-				goto fail_str;
-			}
-		}
-		*perr = false;
-
-		// Actual matching
-		bool res = false;
-		for (size_t i = 0; i < ntargets; ++i) {
-			const char *tgt = targets[i];
-			switch (pleaf->op) {
-			case C2_L_OEXISTS: res = true; break;
-			case C2_L_OEQ:
-				switch (pleaf->match) {
-				case C2_L_MEXACT:
-					if (pleaf->match_ignorecase) {
-						res = !strcasecmp(tgt, pleaf->ptnstr);
-					} else {
-						res = !strcmp(tgt, pleaf->ptnstr);
-					}
-					break;
-				case C2_L_MCONTAINS:
-					if (pleaf->match_ignorecase) {
-						res = strcasestr(tgt, pleaf->ptnstr);
-					} else {
-						res = strstr(tgt, pleaf->ptnstr);
-					}
-					break;
-				case C2_L_MSTART:
-					if (pleaf->match_ignorecase) {
-						res = !strncasecmp(tgt, pleaf->ptnstr,
-						                   strlen(pleaf->ptnstr));
-					} else {
-						res = !strncmp(tgt, pleaf->ptnstr,
-						               strlen(pleaf->ptnstr));
-					}
-					break;
-				case C2_L_MWILDCARD: {
-					int flags = 0;
-					if (pleaf->match_ignorecase) {
-						flags |= FNM_CASEFOLD;
-					}
-					res = !fnmatch(pleaf->ptnstr, tgt, flags);
-				} break;
-				case C2_L_MPCRE:
-#ifdef CONFIG_REGEX_PCRE
-					assert(strlen(tgt) <= INT_MAX);
-					res = (pcre_exec(pleaf->regex_pcre,
-					                 pleaf->regex_pcre_extra, tgt,
-					                 (int)strlen(tgt), 0, 0, NULL, 0) >= 0);
-#else
-					assert(0);
-#endif
-					break;
-				}
-				break;
-			default: *perr = true; assert(0);
-			}
-			if (res) {
-				break;
-			}
-		}
-		*pres = res;
-
-	fail_str:
-		// Free the string after usage, if necessary
-		if (targets_free_inner) {
-			for (size_t i = 0; i < ntargets; ++i) {
-				if (targets_free_inner[i]) {
-					free((void *)targets_free_inner[i]);
-				}
-			}
-		}
-		// Free property values after usage, if necessary
-		if (targets_free) {
-			free(targets_free);
-		}
-	} break;
-	default: assert(0); break;
-	}
-}
-
-/**
- * Match a window against a single window condition.
- *
- * @return true if matched, false otherwise.
- */
-static bool c2_match_once(session_t *ps, const struct managed_win *w, const c2_ptr_t cond) {
-	bool result = false;
-	bool error = true;
-
-	// Handle a branch
-	if (cond.isbranch) {
-		const c2_b_t *pb = cond.b;
-
-		if (!pb)
-			return false;
-
-		error = false;
-
-		switch (pb->op) {
-		case C2_B_OAND:
-			result = (c2_match_once(ps, w, pb->opr1) &&
-			          c2_match_once(ps, w, pb->opr2));
-			break;
-		case C2_B_OOR:
-			result = (c2_match_once(ps, w, pb->opr1) ||
-			          c2_match_once(ps, w, pb->opr2));
-			break;
-		case C2_B_OXOR:
-			result = (c2_match_once(ps, w, pb->opr1) !=
-			          c2_match_once(ps, w, pb->opr2));
-			break;
-		default: error = true; assert(0);
-		}
-
-#ifdef DEBUG_WINMATCH
-		log_trace("(%#010x): branch: result = %d, pattern = ", w->base.id, result);
-		c2_dump(cond);
-		putchar('\n');
-#endif
-	}
-	// Handle a leaf
-	else {
-		const c2_l_t *pleaf = cond.l;
-
-		if (!pleaf)
-			return false;
-
-		c2_match_once_leaf(ps, w, pleaf, &result, &error);
-
-		// For EXISTS operator, no errors are fatal
-		if (C2_L_OEXISTS == pleaf->op && error) {
-			result = false;
-			error = false;
-		}
-
-#ifdef DEBUG_WINMATCH
-		log_trace("(%#010x): leaf: result = %d, error = %d, "
-		          "client = %#010x,  pattern = ",
-		          w->base.id, result, error, w->client_win);
-		c2_dump(cond);
-		putchar('\n');
-#endif
-	}
-
-	// Postprocess the result
-	if (error)
-		result = false;
-
-	if (cond.isbranch ? cond.b->neg : cond.l->neg)
-		result = !result;
-
-	return result;
-}
-
-/**
- * Match a window against a condition linked list.
- *
- * @param cache a place to cache the last matched condition
- * @param pdata a place to return the data
- * @return true if matched, false otherwise.
- */
-bool c2_match(session_t *ps, const struct managed_win *w, const c2_lptr_t *condlst,
-              void **pdata) {
-	assert(ps->server_grabbed);
-	// Then go through the whole linked list
-	for (; condlst; condlst = condlst->next) {
-		if (c2_match_once(ps, w, condlst->ptr)) {
-			if (pdata)
-				*pdata = condlst->data;
-			return true;
-		}
-	}
-
-	return false;
-}