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diff --git a/src/parse/mq.c b/src/parse/mq.c
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+/*
+ * This file is part of LibCSS.
+ * Licensed under the MIT License,
+ * http://www.opensource.org/licenses/mit-license.php
+ * Copyright 2016 John-Mark Bell <jmb@netsurf-browser.org>
+ */
+
+/* https://drafts.csswg.org/mediaqueries/ */
+
+#include <string.h>
+
+#include <libcss/fpmath.h>
+
+#include "stylesheet.h"
+#include "bytecode/bytecode.h"
+#include "parse/mq.h"
+#include "parse/properties/utils.h"
+#include "utils/utils.h"
+
+static void css__mq_value_destroy(css_mq_value *value)
+{
+ assert(value != NULL);
+
+ if (value->type == CSS_MQ_VALUE_TYPE_IDENT) {
+ lwc_string_unref(value->data.ident);
+ }
+}
+
+static void css__mq_feature_destroy(css_mq_feature *feature)
+{
+ if (feature != NULL) {
+ lwc_string_unref(feature->name);
+ css__mq_value_destroy(&feature->value);
+ css__mq_value_destroy(&feature->value2);
+ free(feature);
+ }
+}
+
+static void css__mq_cond_or_feature_destroy(
+ css_mq_cond_or_feature *cond_or_feature);
+
+static void css__mq_cond_parts_destroy(css_mq_cond_parts *cond_parts)
+{
+ if (cond_parts != NULL) {
+ for (uint32_t i = 0; i < cond_parts->nparts; i++) {
+ css__mq_cond_or_feature_destroy(cond_parts->parts[i]);
+ }
+ free(cond_parts->parts);
+ free(cond_parts);
+ }
+}
+
+static void css__mq_cond_destroy(css_mq_cond *cond)
+{
+ if (cond != NULL) {
+ css__mq_cond_parts_destroy(cond->parts);
+ free(cond);
+ }
+}
+
+static void css__mq_cond_or_feature_destroy(
+ css_mq_cond_or_feature *cond_or_feature)
+{
+ if (cond_or_feature != NULL) {
+ switch (cond_or_feature->type) {
+ case CSS_MQ_FEATURE:
+ css__mq_feature_destroy(cond_or_feature->data.feat);
+ break;
+ case CSS_MQ_COND:
+ css__mq_cond_destroy(cond_or_feature->data.cond);
+ break;
+ }
+ free(cond_or_feature);
+ }
+}
+
+void css__mq_query_destroy(css_mq_query *media)
+{
+ while (media != NULL) {
+ css_mq_query *next = media->next;
+
+ css__mq_cond_destroy(media->cond);
+ free(media);
+
+ media = next;
+ }
+}
+
+static css_error mq_parse_condition(lwc_string **strings,
+ const parserutils_vector *vector, int *ctx,
+ bool permit_or, css_mq_cond **cond);
+
+static css_error mq_parse_ratio(
+ const parserutils_vector *vector, int *ctx,
+ const css_token *numerator, css_fixed *ratio)
+{
+ const css_token *token;
+ css_fixed num, den;
+ size_t num_len, den_len;
+
+ /* NUMBER ws* '/' ws* NUMBER */
+
+ /* numerator, ws* already consumed */
+
+ token = parserutils_vector_iterate(vector, ctx);
+ if (token == NULL || tokenIsChar(token, '/') == false) {
+ return CSS_INVALID;
+ }
+
+ consumeWhitespace(vector, ctx);
+
+ token = parserutils_vector_iterate(vector, ctx);
+ if (token == NULL || token->type != CSS_TOKEN_NUMBER) {
+ return CSS_INVALID;
+ }
+
+ num = css__number_from_lwc_string(numerator->idata, true, &num_len);
+ den = css__number_from_lwc_string(token->idata, true, &den_len);
+
+ *ratio = css_divide_fixed(num, den);
+
+ return CSS_OK;
+}
+
+static css_error mq_create_feature(
+ lwc_string *name,
+ css_mq_feature **feature)
+{
+ css_mq_feature *f;
+
+ f = malloc(sizeof(*f));
+ if (f == NULL) {
+ return CSS_NOMEM;
+ }
+
+ memset(f, 0, sizeof(*f));
+
+ f->name = lwc_string_ref(name);
+
+ *feature = f;
+
+ return CSS_OK;
+}
+
+static css_error mq_populate_value(css_mq_value *value,
+ const css_token *token)
+{
+ if (token->type == CSS_TOKEN_NUMBER) {
+ size_t num_len;
+ value->type = CSS_MQ_VALUE_TYPE_NUM;
+ value->data.num_or_ratio = css__number_from_lwc_string(
+ token->idata, false, &num_len);
+ } else if (token->type == CSS_TOKEN_DIMENSION) {
+ size_t len = lwc_string_length(token->idata);
+ const char *data = lwc_string_data(token->idata);
+ uint32_t unit = UNIT_PX;
+ size_t consumed;
+ css_error error;
+
+ value->type = CSS_MQ_VALUE_TYPE_DIM;
+ value->data.dim.len = css__number_from_lwc_string(
+ token->idata, false, &consumed);
+ error = css__parse_unit_keyword(data + consumed, len - consumed,
+ &unit);
+ if (error != CSS_OK) {
+ return error;
+ }
+ value->data.dim.unit = unit;
+ } else if (token->type == CSS_TOKEN_IDENT) {
+ value->type = CSS_MQ_VALUE_TYPE_IDENT;
+ value->data.ident = lwc_string_ref(token->idata);
+ }
+
+ return CSS_OK;
+}
+
+static css_error mq_parse_op(const css_token *token,
+ css_mq_feature_op *op)
+{
+ size_t len;
+ const char *data;
+
+ if (token == NULL || token->type != CSS_TOKEN_CHAR)
+ return CSS_INVALID;
+
+ len = lwc_string_length(token->idata);
+ data = lwc_string_data(token->idata);
+
+ if (len == 2) {
+ if (strncasecmp(data, "<=", 2) == 0)
+ *op = CSS_MQ_FEATURE_OP_LTE;
+ else if (strncasecmp(data, ">=", 2) == 0)
+ *op = CSS_MQ_FEATURE_OP_GTE;
+ else
+ return CSS_INVALID;
+ } else if (len == 1) {
+ if (*data == '<')
+ *op = CSS_MQ_FEATURE_OP_LT;
+ else if (*data == '=')
+ *op = CSS_MQ_FEATURE_OP_EQ;
+ else if (*data == '>')
+ *op = CSS_MQ_FEATURE_OP_GT;
+ else
+ return CSS_INVALID;
+ } else {
+ return CSS_INVALID;
+ }
+
+ return CSS_OK;
+}
+
+static css_error mq_parse_range(lwc_string **strings,
+ const parserutils_vector *vector, int *ctx,
+ const css_token *name_or_value,
+ css_mq_feature **feature)
+{
+ const css_token *token, *value_or_name, *name = NULL, *value2 = NULL;
+ css_mq_feature *result;
+ css_mq_feature_op op, op2;
+ css_fixed ratio, ratio2;
+ bool name_first = false, value_is_ratio = false, value2_is_ratio = false, match;
+ css_error error;
+
+ /* <mf-range> = <mf-name> [ '<' | '>' ]? '='? <mf-value>
+ * | <mf-value> [ '<' | '>' ]? '='? <mf-name>
+ * | <mf-value> '<' '='? <mf-name> '<' '='? <mf-value>
+ * | <mf-value> '>' '='? <mf-name> '>' '='? <mf-value>
+ */
+
+ if (name_or_value == NULL || (name_or_value->type != CSS_TOKEN_NUMBER &&
+ name_or_value->type != CSS_TOKEN_DIMENSION &&
+ name_or_value->type != CSS_TOKEN_IDENT)) {
+ return CSS_INVALID;
+ }
+
+ consumeWhitespace(vector, ctx);
+
+ /* Name-or-value */
+ if (name_or_value->type == CSS_TOKEN_NUMBER &&
+ tokenIsChar(parserutils_vector_peek(vector, *ctx), '/')) {
+ /* ratio */
+ error = mq_parse_ratio(vector, ctx, name_or_value, &ratio);
+ if (error != CSS_OK) {
+ return error;
+ }
+
+ consumeWhitespace(vector, ctx);
+
+ value_is_ratio = true;
+ } else if (name_or_value->type == CSS_TOKEN_IDENT &&
+ lwc_string_caseless_isequal(name_or_value->idata,
+ strings[INFINITE], &match) == lwc_error_ok &&
+ match == false) {
+ /* The only ident permitted for mf-value is 'infinite', thus must have name */
+ name = name_or_value;
+ name_first = true;
+ }
+
+ /* Op */
+ token = parserutils_vector_iterate(vector, ctx);
+ error = mq_parse_op(token, &op);
+ if (error != CSS_OK) {
+ return error;
+ }
+
+ consumeWhitespace(vector, ctx);
+
+ /* Value-or-name */
+ value_or_name = parserutils_vector_iterate(vector, ctx);
+ if (value_or_name == NULL || (value_or_name->type != CSS_TOKEN_NUMBER &&
+ value_or_name->type != CSS_TOKEN_DIMENSION &&
+ value_or_name->type != CSS_TOKEN_IDENT)) {
+ return CSS_INVALID;
+ }
+
+ if (name == NULL) {
+ if (value_or_name->type != CSS_TOKEN_IDENT) {
+ return CSS_INVALID;
+ } else {
+ name = value_or_name;
+ }
+ }
+
+ consumeWhitespace(vector, ctx);
+
+ if (value_or_name->type == CSS_TOKEN_NUMBER &&
+ tokenIsChar(parserutils_vector_peek(vector, *ctx), '/')) {
+ /* ratio */
+ error = mq_parse_ratio(vector, ctx, token, &ratio);
+ if (error != CSS_OK) {
+ return error;
+ }
+
+ consumeWhitespace(vector, ctx);
+
+ value_is_ratio = true;
+ }
+
+ token = parserutils_vector_peek(vector, *ctx);
+ if (name_first == false && token != NULL && tokenIsChar(token, ')') == false) {
+ /* Op2 */
+ token = parserutils_vector_iterate(vector, ctx);
+ error = mq_parse_op(token, &op2);
+ if (error != CSS_OK) {
+ return error;
+ }
+
+ consumeWhitespace(vector, ctx);
+
+ /* Validate operators: must both be LT(E) or GT(E) */
+ if (op == CSS_MQ_FEATURE_OP_LT || op == CSS_MQ_FEATURE_OP_LTE) {
+ if (op2 != CSS_MQ_FEATURE_OP_LT && op2 != CSS_MQ_FEATURE_OP_LTE) {
+ return CSS_INVALID;
+ }
+ } else if (op == CSS_MQ_FEATURE_OP_GT || op == CSS_MQ_FEATURE_OP_GTE) {
+ if (op2 != CSS_MQ_FEATURE_OP_GT && op2 != CSS_MQ_FEATURE_OP_GTE) {
+ return CSS_INVALID;
+ }
+ } else {
+ return CSS_INVALID;
+ }
+
+ /* Value2 */
+ value2 = parserutils_vector_iterate(vector, ctx);
+ if (value2 == NULL || (value2->type != CSS_TOKEN_NUMBER &&
+ value2->type != CSS_TOKEN_DIMENSION &&
+ value2->type != CSS_TOKEN_IDENT)) {
+ return CSS_INVALID;
+ }
+
+ consumeWhitespace(vector, ctx);
+
+ if (value_or_name->type == CSS_TOKEN_NUMBER &&
+ tokenIsChar(parserutils_vector_peek(vector, *ctx), '/')) {
+ /* ratio */
+ error = mq_parse_ratio(vector, ctx, token, &ratio2);
+ if (error != CSS_OK) {
+ return error;
+ }
+
+ consumeWhitespace(vector, ctx);
+
+ value2_is_ratio = true;
+ }
+ }
+
+ error = mq_create_feature(name->idata, &result);
+ if (error != CSS_OK) {
+ return error;
+ }
+ if (name_first) {
+ /* Invert operator */
+ if (op == CSS_MQ_FEATURE_OP_LT) {
+ op = CSS_MQ_FEATURE_OP_GTE;
+ } else if (op == CSS_MQ_FEATURE_OP_LTE) {
+ op = CSS_MQ_FEATURE_OP_GT;
+ } else if (op == CSS_MQ_FEATURE_OP_GT) {
+ op = CSS_MQ_FEATURE_OP_LTE;
+ } else if (op == CSS_MQ_FEATURE_OP_GTE) {
+ op = CSS_MQ_FEATURE_OP_LT;
+ }
+ }
+ result->op = op;
+ if (value_is_ratio) {
+ result->value.type = CSS_MQ_VALUE_TYPE_RATIO;
+ result->value.data.num_or_ratio = ratio;
+ } else {
+ /* num/dim/ident */
+ error = mq_populate_value(&result->value, token);
+ if (error != CSS_OK) {
+ free(result);
+ return error;
+ }
+ }
+ if (value2 != NULL) {
+ result->op2 = op2;
+ if (value2_is_ratio) {
+ result->value2.type = CSS_MQ_VALUE_TYPE_RATIO;
+ result->value2.data.num_or_ratio = ratio;
+ } else {
+ /* num/dim/ident */
+ error = mq_populate_value(&result->value2, token);
+ if (error != CSS_OK) {
+ css__mq_feature_destroy(result);
+ return error;
+ }
+ }
+ }
+
+ *feature = result;
+
+ return CSS_OK;
+}
+
+static css_error mq_parse_media_feature(lwc_string **strings,
+ const parserutils_vector *vector, int *ctx,
+ css_mq_feature **feature)
+{
+ const css_token *name_or_value, *token;
+ css_mq_feature *result;
+ css_error error;
+
+ /* <media-feature> = ( [ <mf-plain> | <mf-boolean> | <mf-range> ] )
+ * <mf-plain> = <mf-name> : <mf-value>
+ * <mf-boolean> = <mf-name>
+ * <mf-name> = <ident>
+ * <mf-value> = <number> | <dimension> | <ident> | <ratio>
+ */
+
+ /* ( already consumed */
+
+ consumeWhitespace(vector, ctx);
+
+ name_or_value = parserutils_vector_iterate(vector, ctx);
+ if (name_or_value == NULL)
+ return CSS_INVALID;
+
+ if (name_or_value->type == CSS_TOKEN_IDENT) {
+ consumeWhitespace(vector, ctx);
+
+ token = parserutils_vector_peek(vector, *ctx);
+ if (tokenIsChar(token, ')')) {
+ /* mf-boolean */
+ error = mq_create_feature(name_or_value->idata, &result);
+ if (error != CSS_OK) {
+ return error;
+ }
+
+ result->op = CSS_MQ_FEATURE_OP_BOOL;
+ } else if (tokenIsChar(token, ':')) {
+ /* mf-plain */
+ parserutils_vector_iterate(vector, ctx);
+
+ consumeWhitespace(vector, ctx);
+
+ token = parserutils_vector_iterate(vector, ctx);
+ if (token == NULL || (token->type != CSS_TOKEN_NUMBER &&
+ token->type != CSS_TOKEN_DIMENSION &&
+ token->type != CSS_TOKEN_IDENT)) {
+ return CSS_INVALID;
+ }
+
+ consumeWhitespace(vector, ctx);
+
+ error = mq_create_feature(name_or_value->idata, &result);
+ if (error != CSS_OK) {
+ return error;
+ }
+ result->op = CSS_MQ_FEATURE_OP_EQ;
+
+ if (token->type == CSS_TOKEN_NUMBER &&
+ tokenIsChar(parserutils_vector_peek(vector, *ctx), '/')) {
+ /* ratio */
+ css_fixed ratio;
+
+ error = mq_parse_ratio(vector, ctx, token, &ratio);
+ if (error != CSS_OK) {
+ free(result);
+ return error;
+ }
+
+ result->value.type = CSS_MQ_VALUE_TYPE_RATIO;
+ result->value.data.num_or_ratio = ratio;
+ } else {
+ /* num/dim/ident */
+ error = mq_populate_value(&result->value, token);
+ if (error != CSS_OK) {
+ free(result);
+ return error;
+ }
+ }
+
+ consumeWhitespace(vector, ctx);
+ } else {
+ /* mf-range */
+ error = mq_parse_range(strings, vector, ctx,
+ name_or_value, &result);
+ if (error != CSS_OK) {
+ return error;
+ }
+
+ consumeWhitespace(vector, ctx);
+ }
+ } else {
+ /* mf-range */
+ error = mq_parse_range(strings, vector, ctx,
+ name_or_value, &result);
+ if (error != CSS_OK) {
+ return error;
+ }
+
+ consumeWhitespace(vector, ctx);
+ }
+
+ token = parserutils_vector_iterate(vector, ctx);
+ if (tokenIsChar(token, ')') == false) {
+ css__mq_feature_destroy(result);
+ return CSS_INVALID;
+ }
+
+ *feature = result;
+
+ return CSS_OK;
+}
+
+/*
+ * Consume any value
+ *
+ * CSS Syntax Module Level 3: 8.2
+ */
+static css_error mq_parse_consume_any_value(lwc_string **strings,
+ const parserutils_vector *vector, int *ctx,
+ bool until, const char until_char)
+{
+ const css_token *token;
+ css_error error;
+
+ while (true) {
+ consumeWhitespace(vector, ctx);
+
+ token = parserutils_vector_iterate(vector, ctx);
+ if (token == NULL) {
+ return CSS_INVALID;
+ }
+
+ switch (token->type) {
+ case CSS_TOKEN_INVALID_STRING:
+ return CSS_INVALID;
+
+ case CSS_TOKEN_CHAR:
+ if (until && tokenIsChar(token, until_char)) {
+ /* Found matching close bracket */
+ return CSS_OK;
+
+ } else if (tokenIsChar(token, ')') ||
+ tokenIsChar(token, ']') ||
+ tokenIsChar(token, '}')) {
+ /* Non-matching close bracket */
+ return CSS_INVALID;
+ }
+ if (tokenIsChar(token, '(')) {
+ /* Need to consume until matching bracket. */
+ error = mq_parse_consume_any_value(strings,
+ vector, ctx, true, ')');
+ if (error != CSS_OK) {
+ return error;
+ }
+ } else if (tokenIsChar(token, '[')) {
+ /* Need to consume until matching bracket. */
+ error = mq_parse_consume_any_value(strings,
+ vector, ctx, true, ']');
+ if (error != CSS_OK) {
+ return error;
+ }
+ } else if (tokenIsChar(token, '{')) {
+ /* Need to consume until matching bracket. */
+ error = mq_parse_consume_any_value(strings,
+ vector, ctx, true, '}');
+ if (error != CSS_OK) {
+ return error;
+ }
+ }
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ return CSS_OK;
+}
+
+static css_error mq_parse_general_enclosed(lwc_string **strings,
+ const parserutils_vector *vector, int *ctx)
+{
+ const css_token *token;
+ css_error error;
+
+ /* <general-enclosed> = [ <function-token> <any-value> ) ]
+ * | ( <ident> <any-value> )
+ */
+
+ token = parserutils_vector_iterate(vector, ctx);
+ if (token == NULL) {
+ return CSS_INVALID;
+ }
+
+ switch (token->type) {
+ case CSS_TOKEN_FUNCTION:
+ error = mq_parse_consume_any_value(strings, vector, ctx,
+ true, ')');
+ if (error != CSS_OK) {
+ return error;
+ }
+
+ token = parserutils_vector_peek(vector, *ctx);
+ if (!tokenIsChar(token, ')')) {
+ return CSS_INVALID;
+ }
+ break;
+
+ case CSS_TOKEN_IDENT:
+ error = mq_parse_consume_any_value(strings, vector, ctx,
+ false, '\0');
+ if (error != CSS_OK) {
+ return error;
+ }
+ break;
+
+ default:
+ return CSS_INVALID;
+ }
+
+ return CSS_OK;
+}
+
+static css_error mq_parse_media_in_parens(lwc_string **strings,
+ const parserutils_vector *vector, int *ctx,
+ css_mq_cond_or_feature **cond_or_feature)
+{
+ const css_token *token;
+ bool match;
+ int old_ctx;
+ css_mq_cond_or_feature *result = NULL;
+ css_error error = CSS_OK;
+
+ /* <media-in-parens> = ( <media-condition> ) | <media-feature> | <general-enclosed>
+ */
+
+ //LPAREN -> condition-or-feature
+ // "not" or LPAREN -> condition
+ // IDENT | NUMBER | DIMENSION | RATIO -> feature
+
+ token = parserutils_vector_iterate(vector, ctx);
+ if (token == NULL || tokenIsChar(token, '(') == false) {
+ return CSS_INVALID;
+ }
+
+ consumeWhitespace(vector, ctx);
+
+ token = parserutils_vector_peek(vector, *ctx);
+ if (token == NULL) {
+ return CSS_INVALID;
+ }
+
+ old_ctx = *ctx;
+
+ if (tokenIsChar(token, '(') || (token->type == CSS_TOKEN_IDENT &&
+ lwc_string_caseless_isequal(token->idata,
+ strings[NOT], &match) == lwc_error_ok &&
+ match)) {
+ css_mq_cond *cond;
+ error = mq_parse_condition(strings, vector, ctx, true, &cond);
+ if (error == CSS_OK) {
+ token = parserutils_vector_iterate(vector, ctx);
+ if (tokenIsChar(token, ')') == false) {
+ return CSS_INVALID;
+ }
+
+ result = malloc(sizeof(*result));
+ if (result == NULL) {
+ css__mq_cond_destroy(cond);
+ return CSS_NOMEM;
+ }
+ memset(result, 0, sizeof(*result));
+ result->type = CSS_MQ_COND;
+ result->data.cond = cond;
+ *cond_or_feature = result;
+ return CSS_OK;
+ }
+ } else if (token->type == CSS_TOKEN_IDENT ||
+ token->type == CSS_TOKEN_NUMBER ||
+ token->type == CSS_TOKEN_DIMENSION) {
+ css_mq_feature *feature;
+ error = mq_parse_media_feature(strings, vector, ctx, &feature);
+ if (error == CSS_OK) {
+ result = malloc(sizeof(*result));
+ if (result == NULL) {
+ css__mq_feature_destroy(feature);
+ return CSS_NOMEM;
+ }
+ memset(result, 0, sizeof(*result));
+ result->type = CSS_MQ_FEATURE;
+ result->data.feat = feature;
+ *cond_or_feature = result;
+ return CSS_OK;
+ }
+ }
+
+ *ctx = old_ctx;
+ error = mq_parse_general_enclosed(strings, vector, ctx);
+
+ return error;
+}
+
+static css_error mq_parse_condition(lwc_string **strings,
+ const parserutils_vector *vector, int *ctx,
+ bool permit_or, css_mq_cond **cond)
+{
+ const css_token *token;
+ bool match = false;
+ int op = 0; /* Will be AND | OR once we've had one */
+ css_mq_cond_or_feature *cond_or_feature, **parts;
+ css_mq_cond *result;
+ css_error error;
+
+ /* <media-condition> = <media-not> | <media-in-parens> [ <media-and>* | <media-or>* ]
+ * <media-condition-without-or> = <media-not> | <media-in-parens> <media-and>*
+ * <media-not> = not <media-in-parens>
+ * <media-and> = and <media-in-parens>
+ * <media-or> = or <media-in-parens>
+ */
+
+ token = parserutils_vector_peek(vector, *ctx);
+ if (token == NULL ||
+ (tokenIsChar(token, '(') == false &&
+ token->type != CSS_TOKEN_IDENT &&
+ lwc_string_caseless_isequal(token->idata,
+ strings[NOT], &match) != lwc_error_ok &&
+ match == false)) {
+ return CSS_INVALID;
+ }
+
+ result = malloc(sizeof(*result));
+ if (result == NULL) {
+ return CSS_NOMEM;
+ }
+ memset(result, 0, sizeof(*result));
+ result->parts = malloc(sizeof(*result->parts));
+ if (result->parts == NULL) {
+ free(result);
+ return CSS_NOMEM;
+ }
+ memset(result->parts, 0, sizeof(*result->parts));
+
+ if (tokenIsChar(token, '(') == false) {
+ /* Must be "not" */
+ parserutils_vector_iterate(vector, ctx);
+ consumeWhitespace(vector, ctx);
+
+ error = mq_parse_media_in_parens(strings,
+ vector, ctx, &cond_or_feature);
+ if (error != CSS_OK) {
+ css__mq_cond_destroy(result);
+ return CSS_INVALID;
+ }
+
+ result->negate = 1;
+ result->parts->nparts = 1;
+ result->parts->parts = malloc(sizeof(*result->parts->parts));
+ if (result->parts->parts == NULL) {
+ css__mq_cond_or_feature_destroy(cond_or_feature);
+ css__mq_cond_destroy(result);
+ return CSS_NOMEM;
+ }
+ result->parts->parts[0] = cond_or_feature;
+
+ *cond = result;
+
+ return CSS_OK;
+ }
+
+ /* FOLLOW(media-condition) := RPAREN | COMMA | EOF */
+ while (token != NULL && tokenIsChar(token, ')') == false &&
+ tokenIsChar(token, ',') == false) {
+ error = mq_parse_media_in_parens(strings, vector, ctx,
+ &cond_or_feature);
+ if (error != CSS_OK) {
+ css__mq_cond_destroy(result);
+ return CSS_INVALID;
+ }
+
+ parts = realloc(result->parts->parts,
+ (result->parts->nparts+1)*sizeof(*result->parts->parts));
+ if (parts == NULL) {
+ css__mq_cond_or_feature_destroy(cond_or_feature);
+ css__mq_cond_destroy(result);
+ return CSS_NOMEM;
+ }
+ parts[result->parts->nparts] = cond_or_feature;
+ result->parts->parts = parts;
+ result->parts->nparts++;
+
+ consumeWhitespace(vector, ctx);
+
+ token = parserutils_vector_peek(vector, *ctx);
+ if (token != NULL && tokenIsChar(token, ')') == false &&
+ tokenIsChar(token, ',') == false) {
+ if (token->type != CSS_TOKEN_IDENT) {
+ css__mq_cond_destroy(result);
+ return CSS_INVALID;
+ } else if (lwc_string_caseless_isequal(token->idata,
+ strings[AND], &match) == lwc_error_ok &&
+ match) {
+ if (op != 0 && op != AND) {
+ css__mq_cond_destroy(result);
+ return CSS_INVALID;
+ }
+ op = AND;
+ } else if (lwc_string_caseless_isequal(token->idata,
+ strings[OR], &match) == lwc_error_ok &&
+ match) {
+ if (permit_or == false || (op != 0 && op != OR)) {
+ css__mq_cond_destroy(result);
+ return CSS_INVALID;
+ }
+ op = OR;
+ } else {
+ /* Neither AND nor OR */
+ css__mq_cond_destroy(result);
+ return CSS_INVALID;
+ }
+
+ parserutils_vector_iterate(vector, ctx);
+ consumeWhitespace(vector, ctx);
+ }
+ }
+
+ if (op == OR) {
+ result->op = 1;
+ }
+
+ *cond = result;
+
+ return CSS_OK;
+}
+
+/**
+ * Parse a media query type.
+ */
+static uint64_t mq_parse_type(lwc_string **strings, lwc_string *type)
+{
+ bool match;
+
+ if (type == NULL) {
+ return CSS_MEDIA_ALL;
+ } else if (lwc_string_caseless_isequal(
+ type, strings[AURAL],
+ &match) == lwc_error_ok && match) {
+ return CSS_MEDIA_AURAL;
+ } else if (lwc_string_caseless_isequal(
+ type, strings[BRAILLE],
+ &match) == lwc_error_ok && match) {
+ return CSS_MEDIA_BRAILLE;
+ } else if (lwc_string_caseless_isequal(
+ type, strings[EMBOSSED],
+ &match) == lwc_error_ok && match) {
+ return CSS_MEDIA_EMBOSSED;
+ } else if (lwc_string_caseless_isequal(
+ type, strings[HANDHELD],
+ &match) == lwc_error_ok && match) {
+ return CSS_MEDIA_HANDHELD;
+ } else if (lwc_string_caseless_isequal(
+ type, strings[PRINT],
+ &match) == lwc_error_ok && match) {
+ return CSS_MEDIA_PRINT;
+ } else if (lwc_string_caseless_isequal(
+ type, strings[PROJECTION],
+ &match) == lwc_error_ok && match) {
+ return CSS_MEDIA_PROJECTION;
+ } else if (lwc_string_caseless_isequal(
+ type, strings[SCREEN],
+ &match) == lwc_error_ok && match) {
+ return CSS_MEDIA_SCREEN;
+ } else if (lwc_string_caseless_isequal(
+ type, strings[SPEECH],
+ &match) == lwc_error_ok && match) {
+ return CSS_MEDIA_SPEECH;
+ } else if (lwc_string_caseless_isequal(
+ type, strings[TTY],
+ &match) == lwc_error_ok && match) {
+ return CSS_MEDIA_TTY;
+ } else if (lwc_string_caseless_isequal(
+ type, strings[TV],
+ &match) == lwc_error_ok && match) {
+ return CSS_MEDIA_TV;
+ } else if (lwc_string_caseless_isequal(
+ type, strings[ALL],
+ &match) == lwc_error_ok && match) {
+ return CSS_MEDIA_ALL;
+ }
+
+ return 0;
+}
+
+static css_error mq_parse_media_query(lwc_string **strings,
+ const parserutils_vector *vector, int *ctx,
+ css_mq_query **query)
+{
+ const css_token *token;
+ bool match, is_condition = false;
+ css_mq_query *result;
+ css_error error;
+
+ /* <media-query> = <media-condition>
+ * | [ not | only ]? <media-type> [ and <media-condition-without-or> ]?
+ * <media-type> = <ident> (except "not", "and", "or", "only")
+ */
+
+ // LPAREN -> media-condition
+ // not LPAREN -> media-condition
+
+ consumeWhitespace(vector, ctx);
+
+ token = parserutils_vector_peek(vector, *ctx);
+ if (tokenIsChar(token, '(')) {
+ is_condition = true;
+ } else if (token->type == CSS_TOKEN_IDENT &&
+ lwc_string_caseless_isequal(token->idata,
+ strings[NOT], &match) == lwc_error_ok &&
+ match) {
+ int old_ctx = *ctx;
+
+ parserutils_vector_iterate(vector, ctx);
+ consumeWhitespace(vector, ctx);
+
+ token = parserutils_vector_peek(vector, *ctx);
+ if (tokenIsChar(token, '(')) {
+ is_condition = true;
+ }
+
+ *ctx = old_ctx;
+ }
+
+ result = malloc(sizeof(*result));
+ if (result == NULL) {
+ return CSS_NOMEM;
+ }
+ memset(result, 0, sizeof(*result));
+
+ if (is_condition) {
+ /* media-condition */
+ error = mq_parse_condition(strings, vector, ctx, true,
+ &result->cond);
+ if (error != CSS_OK) {
+ free(result);
+ return error;
+ }
+
+ *query = result;
+ return CSS_OK;
+ }
+
+ token = parserutils_vector_iterate(vector, ctx);
+ if (token == NULL || token->type != CSS_TOKEN_IDENT) {
+ free(result);
+ return CSS_INVALID;
+ }
+
+ if (lwc_string_caseless_isequal(token->idata,
+ strings[NOT], &match) == lwc_error_ok && match) {
+ result->negate_type = 1;
+ consumeWhitespace(vector, ctx);
+ token = parserutils_vector_iterate(vector, ctx);
+ } else if (lwc_string_caseless_isequal(token->idata,
+ strings[ONLY], &match) == lwc_error_ok && match) {
+ consumeWhitespace(vector, ctx);
+ token = parserutils_vector_iterate(vector, ctx);
+ }
+
+ if (token == NULL || token->type != CSS_TOKEN_IDENT) {
+ free(result);
+ return CSS_INVALID;
+ }
+
+ result->type = mq_parse_type(strings, token->idata);
+
+ consumeWhitespace(vector, ctx);
+
+ token = parserutils_vector_iterate(vector, ctx);
+ if (token != NULL) {
+ if (token->type != CSS_TOKEN_IDENT ||
+ lwc_string_caseless_isequal(token->idata,
+ strings[AND], &match) != lwc_error_ok ||
+ match == false) {
+ free(result);
+ return CSS_INVALID;
+ }
+
+ consumeWhitespace(vector, ctx);
+
+ error = mq_parse_condition(strings, vector, ctx, false,
+ &result->cond);
+ if (error != CSS_OK) {
+ free(result);
+ return error;
+ }
+ }
+
+ *query = result;
+ return CSS_OK;
+}
+
+css_error css__mq_parse_media_list(lwc_string **strings,
+ const parserutils_vector *vector, int *ctx,
+ css_mq_query **media)
+{
+ css_mq_query *result = NULL, *last = NULL;
+ const css_token *token;
+ css_error error;
+
+ /* <media-query-list> = <media-query> [ COMMA <media-query> ]* */
+
+ /* if {[(, push }]) to stack
+ * if func, push ) to stack
+ * on error, scan forward until stack is empty (or EOF), popping matching tokens off stack
+ * if stack is empty, the next input token must be comma or EOF
+ * if comma, consume, and start again from the next input token
+ */
+
+ token = parserutils_vector_peek(vector, *ctx);
+ while (token != NULL) {
+ css_mq_query *query;
+
+ error = mq_parse_media_query(strings, vector, ctx, &query);
+ if (error != CSS_OK) {
+ /* TODO: error recovery (see above) */
+ css__mq_query_destroy(result);
+ return error;
+ } else {
+ if (result == NULL) {
+ result = last = query;
+ } else {
+ assert(last != NULL);
+ last->next = query;
+ last = query;
+ }
+ }
+
+ consumeWhitespace(vector, ctx);
+
+ token = parserutils_vector_iterate(vector, ctx);
+ if (token != NULL && tokenIsChar(token, ',') == false) {
+ /* Give up */
+ break;
+ }
+ }
+
+ *media = result;
+
+ return CSS_OK;
+}
+
+typedef struct css_mq_parse_ctx {
+ lwc_string **strings;
+ css_mq_query *media;
+} css_mq_parse_ctx;
+
+static css_error css_parse_media_query_handle_event(
+ css_parser_event type,
+ const parserutils_vector *tokens,
+ void *pw)
+{
+ int idx = 0;
+ css_error err;
+ css_mq_query *media;
+ const css_token *tok;
+ css_mq_parse_ctx *ctx = pw;
+ lwc_string **strings = ctx->strings;
+
+ UNUSED(type);
+
+ /* Skip @media */
+ tok = parserutils_vector_iterate(tokens, &idx);
+ assert(tok->type == CSS_TOKEN_ATKEYWORD);
+ UNUSED(tok);
+
+ /* Skip whitespace */
+ tok = parserutils_vector_iterate(tokens, &idx);
+ assert(tok->type == CSS_TOKEN_S);
+ UNUSED(tok);
+
+ err = css__mq_parse_media_list(strings, tokens, &idx, &media);
+ if (err != CSS_OK) {
+ return CSS_OK;
+ }
+
+ ctx->media = media;
+ return CSS_OK;
+}
+
+css_error css_parse_media_query(lwc_string **strings,
+ const uint8_t *mq, size_t len,
+ css_mq_query **media_out)
+{
+ css_error err;
+ css_parser *parser;
+ css_mq_parse_ctx ctx = {
+ .strings = strings,
+ };
+ css_parser_optparams params_quirks = {
+ .quirks = false,
+ };
+ css_parser_optparams params_handler = {
+ .event_handler = {
+ .handler = css_parse_media_query_handle_event,
+ .pw = &ctx,
+ },
+ };
+
+ if (mq == NULL || len == 0) {
+ return CSS_BADPARM;
+ }
+
+ err = css__parser_create_for_media_query(NULL,
+ CSS_CHARSET_DEFAULT, &parser);
+ if (err != CSS_OK) {
+ return err;
+ }
+
+ err = css__parser_setopt(parser, CSS_PARSER_QUIRKS,
+ &params_quirks);
+ if (err != CSS_OK) {
+ css__parser_destroy(parser);
+ return err;
+ }
+
+ err = css__parser_setopt(parser, CSS_PARSER_EVENT_HANDLER,
+ &params_handler);
+ if (err != CSS_OK) {
+ css__parser_destroy(parser);
+ return err;
+ }
+
+ err = css__parser_parse_chunk(parser,
+ (const uint8_t *)"@media ",
+ strlen("@media "));
+ if (err != CSS_OK && err != CSS_NEEDDATA) {
+ css__parser_destroy(parser);
+ return err;
+ }
+
+ err = css__parser_parse_chunk(parser, mq, len);
+ if (err != CSS_OK && err != CSS_NEEDDATA) {
+ css__parser_destroy(parser);
+ return err;
+ }
+
+ err = css__parser_completed(parser);
+ if (err != CSS_OK) {
+ css__parser_destroy(parser);
+ return err;
+ }
+
+ css__parser_destroy(parser);
+
+ *media_out = ctx.media;
+ return CSS_OK;
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-20 00:44:48 +0000