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/*
* This file is part of LibCSS.
* Licensed under the MIT License,
* http://www.opensource.org/licenses/mit-license.php
* Copyright 2009 John-Mark Bell <jmb@netsurf-browser.org>
*/
#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 pause shorthand
*
* \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 parse_pause(css_language *c,
const parserutils_vector *vector, int *ctx,
css_style **result)
{
int orig_ctx = *ctx;
const css_token *token;
css_style *before = NULL;
css_style *after = NULL;
css_style *ret = NULL;
int num_read = 0;
int prev_ctx;
uint32_t required_size;
bool match;
css_error error;
/* Deal with inherit */
token = parserutils_vector_peek(vector, *ctx);
if (token != NULL && token->type == CSS_TOKEN_IDENT &&
(lwc_string_caseless_isequal(
token->idata, c->strings[INHERIT],
&match) == lwc_error_ok && match)) {
uint32_t *bytecode;
error = css_stylesheet_style_create(c->sheet,
2 * sizeof(uint32_t), &ret);
if (error != CSS_OK) {
*ctx = orig_ctx;
return error;
}
bytecode = (uint32_t *) ret->bytecode;
*(bytecode++) = buildOPV(CSS_PROP_PAUSE_BEFORE,
FLAG_INHERIT, 0);
*(bytecode++) = buildOPV(CSS_PROP_PAUSE_AFTER,
FLAG_INHERIT, 0);
parserutils_vector_iterate(vector, ctx);
*result = ret;
return CSS_OK;
} else if (token == NULL) {
/* No tokens -- clearly garbage */
*ctx = orig_ctx;
return CSS_INVALID;
}
/* Attempt to read 1 or 2 pauses */
do {
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 && token->type == CSS_TOKEN_IDENT &&
(lwc_string_caseless_isequal(
token->idata, c->strings[INHERIT],
&match) == lwc_error_ok && match)) {
error = CSS_INVALID;
goto cleanup;
}
if (before == NULL && (error = parse_pause_before(c, vector,
ctx, &before)) == CSS_OK) {
num_read = 1;
} else if (after == NULL &&
(error = parse_pause_after(c, vector, ctx,
&after)) == CSS_OK) {
num_read = 2;
}
if (error == CSS_OK) {
consumeWhitespace(vector, ctx);
token = parserutils_vector_peek(vector, *ctx);
} else {
token = NULL;
}
} while (*ctx != prev_ctx && token != NULL);
if (num_read == 0) {
error = CSS_INVALID;
goto cleanup;
}
/* Calculate size of resultant style */
if (num_read == 1)
required_size = 2 * before->length;
else
required_size = before->length + after->length;
error = css_stylesheet_style_create(c->sheet, required_size, &ret);
if (error != CSS_OK)
goto cleanup;
required_size = 0;
if (num_read == 1) {
uint32_t *opv = ((uint32_t *) before->bytecode);
uint8_t flags = getFlags(*opv);
uint16_t value = getValue(*opv);
memcpy(((uint8_t *) ret->bytecode) + required_size,
before->bytecode, before->length);
required_size += before->length;
*opv = buildOPV(CSS_PROP_PAUSE_AFTER, flags, value);
memcpy(((uint8_t *) ret->bytecode) + required_size,
before->bytecode, before->length);
required_size += before->length;
} else {
memcpy(((uint8_t *) ret->bytecode) + required_size,
before->bytecode, before->length);
required_size += before->length;
memcpy(((uint8_t *) ret->bytecode) + required_size,
after->bytecode, after->length);
required_size += after->length;
}
assert(required_size == ret->length);
/* Write the result */
*result = ret;
/* Invalidate ret so that cleanup doesn't destroy it */
ret = NULL;
/* Clean up after ourselves */
cleanup:
if (before)
css_stylesheet_style_destroy(c->sheet, before, error == CSS_OK);
if (after)
css_stylesheet_style_destroy(c->sheet, after, error == CSS_OK);
if (ret)
css_stylesheet_style_destroy(c->sheet, ret, error == CSS_OK);
if (error != CSS_OK)
*ctx = orig_ctx;
return error;
}
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