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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 letter-spacing
*
* \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_letter_spacing(css_language *c,
const parserutils_vector *vector, int *ctx,
css_style **result)
{
int orig_ctx = *ctx;
css_error error;
const css_token *token;
uint8_t flags = 0;
uint16_t value = 0;
uint32_t opv;
css_fixed length = 0;
uint32_t unit = 0;
uint32_t required_size;
bool match;
/* length | IDENT(normal, inherit) */
token = parserutils_vector_peek(vector, *ctx);
if (token == NULL) {
*ctx = orig_ctx;
return CSS_INVALID;
}
if (token->type == CSS_TOKEN_IDENT &&
(lwc_string_caseless_isequal(
token->idata, c->strings[INHERIT],
&match) == lwc_error_ok && match)) {
parserutils_vector_iterate(vector, ctx);
flags = FLAG_INHERIT;
} else if (token->type == CSS_TOKEN_IDENT &&
(lwc_string_caseless_isequal(
token->idata, c->strings[NORMAL],
&match) == lwc_error_ok && match)) {
parserutils_vector_iterate(vector, ctx);
value = LETTER_SPACING_NORMAL;
} else {
error = parse_unit_specifier(c, vector, ctx, UNIT_PX,
&length, &unit);
if (error != CSS_OK) {
*ctx = orig_ctx;
return error;
}
if (unit & UNIT_ANGLE || unit & UNIT_TIME || unit & UNIT_FREQ ||
unit & UNIT_PCT) {
*ctx = orig_ctx;
return CSS_INVALID;
}
value = LETTER_SPACING_SET;
}
opv = buildOPV(CSS_PROP_LETTER_SPACING, flags, value);
required_size = sizeof(opv);
if ((flags & FLAG_INHERIT) == false && value == LETTER_SPACING_SET)
required_size += sizeof(length) + sizeof(unit);
/* Allocate result */
error = css_stylesheet_style_create(c->sheet, required_size, result);
if (error != CSS_OK) {
*ctx = orig_ctx;
return error;
}
/* Copy the bytecode to it */
memcpy((*result)->bytecode, &opv, sizeof(opv));
if ((flags & FLAG_INHERIT) == false && value == LETTER_SPACING_SET) {
memcpy(((uint8_t *) (*result)->bytecode) + sizeof(opv),
&length, sizeof(length));
memcpy(((uint8_t *) (*result)->bytecode) + sizeof(opv) +
sizeof(length), &unit, sizeof(unit));
}
return CSS_OK;
}
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