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-rw-r--r--src/parse/properties/flex.c213
1 files changed, 213 insertions, 0 deletions
diff --git a/src/parse/properties/flex.c b/src/parse/properties/flex.c
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--- /dev/null
+++ b/src/parse/properties/flex.c
@@ -0,0 +1,213 @@
+/*
+ * This file is part of LibCSS.
+ * Licensed under the MIT License,
+ * http://www.opensource.org/licenses/mit-license.php
+ * Copyright 2017 Lucas Neves <lcneves@gmail.com>
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include "bytecode/bytecode.h"
+#include "bytecode/opcodes.h"
+#include "parse/properties/properties.h"
+#include "parse/properties/utils.h"
+
+/**
+ * Parse list-style
+ *
+ * \param c Parsing context
+ * \param vector Vector of tokens to process
+ * \param ctx Pointer to vector iteration context
+ * \param result Pointer to location to receive resulting style
+ * \return CSS_OK on success,
+ * CSS_NOMEM on memory exhaustion,
+ * CSS_INVALID if the input is not valid
+ *
+ * Post condition: \a *ctx is updated with the next token to process
+ * If the input is invalid, then \a *ctx remains unchanged.
+ */
+
+css_error css__parse_flex(css_language *c,
+ const parserutils_vector *vector, int *ctx,
+ css_style *result)
+{
+ int orig_ctx = *ctx;
+ int prev_ctx;
+ const css_token *token;
+ css_error error;
+ bool grow = true;
+ bool shrink = true;
+ bool basis = true;
+ css_style *grow_style;
+ css_style *shrink_style;
+ css_style *basis_style;
+ bool short_auto = false;
+ bool short_none = false;
+ bool match;
+
+ /* Firstly, handle inherit */
+ token = parserutils_vector_peek(vector, *ctx);
+ if (token == NULL)
+ return CSS_INVALID;
+
+ if (is_css_inherit(c, token)) {
+ error = css_stylesheet_style_inherit(result,
+ CSS_PROP_FLEX_GROW);
+ if (error != CSS_OK)
+ return error;
+
+ error = css_stylesheet_style_inherit(result,
+ CSS_PROP_FLEX_SHRINK);
+
+ if (error != CSS_OK)
+ return error;
+
+ error = css_stylesheet_style_inherit(result,
+ CSS_PROP_FLEX_BASIS);
+
+ if (error == CSS_OK)
+ parserutils_vector_iterate(vector, ctx);
+
+ return error;
+ }
+
+ /* allocate styles */
+ error = css__stylesheet_style_create(c->sheet, &grow_style);
+ if (error != CSS_OK)
+ return error;
+
+ error = css__stylesheet_style_create(c->sheet, &shrink_style);
+ if (error != CSS_OK) {
+ css__stylesheet_style_destroy(grow_style);
+ return error;
+ }
+
+ error = css__stylesheet_style_create(c->sheet, &basis_style);
+ if (error != CSS_OK) {
+ css__stylesheet_style_destroy(grow_style);
+ css__stylesheet_style_destroy(shrink_style);
+ return error;
+ }
+
+ /* Handle shorthand none, equivalent of flex: 0 0 auto; */
+ if ((token->type == CSS_TOKEN_IDENT) &&
+ (lwc_string_caseless_isequal(
+ token->idata, c->strings[NONE],
+ &match) == lwc_error_ok && match)) {
+ short_none = true;
+ parserutils_vector_iterate(vector, ctx);
+
+ } else if ((token->type == CSS_TOKEN_IDENT) &&
+ (lwc_string_caseless_isequal(
+ token->idata, c->strings[AUTO],
+ &match) == lwc_error_ok && match)) {
+ /* Handle shorthand auto, equivalent of flex: 1 1 auto; */
+ short_auto = true;
+ parserutils_vector_iterate(vector, ctx);
+
+ } else do {
+ /* Attempt to parse the various longhand properties */
+ prev_ctx = *ctx;
+ error = CSS_OK;
+
+ /* Ensure that we're not about to parse another inherit */
+ token = parserutils_vector_peek(vector, *ctx);
+ if (token != NULL && is_css_inherit(c, token)) {
+ error = CSS_INVALID;
+ goto css__parse_flex_cleanup;
+ }
+
+ if ((grow) &&
+ (error = css__parse_flex_grow(c, vector,
+ ctx, grow_style)) == CSS_OK) {
+ grow = false;
+ } else if ((basis) &&
+ (error = css__parse_flex_basis(c, vector,
+ ctx, basis_style)) == CSS_OK) {
+ basis = false;
+ } else if ((shrink) &&
+ (error = css__parse_flex_shrink(c, vector,
+ ctx, shrink_style)) == CSS_OK) {
+ shrink = false;
+ }
+
+ if (error == CSS_OK) {
+ consumeWhitespace(vector, ctx);
+ token = parserutils_vector_peek(vector, *ctx);
+ } else {
+ /* Forcibly cause loop to exit */
+ token = NULL;
+ }
+ } while (*ctx != prev_ctx && token != NULL);
+
+ /* defaults */
+ if (grow) {
+ error = css__stylesheet_style_appendOPV(grow_style,
+ CSS_PROP_FLEX_GROW, 0, FLEX_GROW_SET);
+ if (error != CSS_OK)
+ goto css__parse_flex_cleanup;
+
+ css_fixed grow_num = short_auto ? INTTOFIX(1) : 0;
+ error = css__stylesheet_style_append(grow_style, grow_num);
+ if (error != CSS_OK)
+ goto css__parse_flex_cleanup;
+ }
+
+ if (shrink) {
+ error = css__stylesheet_style_appendOPV(shrink_style,
+ CSS_PROP_FLEX_SHRINK, 0, FLEX_SHRINK_SET);
+ if (error != CSS_OK)
+ goto css__parse_flex_cleanup;
+
+ css_fixed shrink_num = short_none ? 0 : INTTOFIX(1);
+ error = css__stylesheet_style_append(shrink_style, shrink_num);
+ if (error != CSS_OK)
+ goto css__parse_flex_cleanup;
+ }
+
+ if (basis) {
+ /* Default is auto, but zero if grow or shrink are set */
+ if (!grow || !shrink) {
+ error = css__stylesheet_style_appendOPV(basis_style,
+ CSS_PROP_FLEX_BASIS, 0,
+ FLEX_BASIS_SET);
+ if (error != CSS_OK)
+ goto css__parse_flex_cleanup;
+
+ error = css__stylesheet_style_vappend(
+ basis_style, 2, 0, UNIT_PX);
+ if (error != CSS_OK)
+ goto css__parse_flex_cleanup;
+
+ } else {
+ error = css__stylesheet_style_appendOPV(basis_style,
+ CSS_PROP_FLEX_BASIS, 0,
+ FLEX_BASIS_AUTO);
+ if (error != CSS_OK)
+ goto css__parse_flex_cleanup;
+ }
+ }
+
+ error = css__stylesheet_merge_style(result, grow_style);
+ if (error != CSS_OK)
+ goto css__parse_flex_cleanup;
+
+ error = css__stylesheet_merge_style(result, shrink_style);
+ if (error != CSS_OK)
+ goto css__parse_flex_cleanup;
+
+ error = css__stylesheet_merge_style(result, basis_style);
+
+css__parse_flex_cleanup:
+
+ css__stylesheet_style_destroy(basis_style);
+ css__stylesheet_style_destroy(shrink_style);
+ css__stylesheet_style_destroy(grow_style);
+
+ if (error != CSS_OK)
+ *ctx = orig_ctx;
+
+ return error;
+}
+