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path: root/src/parse/properties/font.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 2009 John-Mark Bell <jmb@netsurf-browser.org>
 */

#include <string.h>

#include "bytecode/bytecode.h"
#include "bytecode/opcodes.h"
#include "parse/properties/properties.h"
#include "parse/properties/utils.h"

/**
 * Determine if a given font-family ident is reserved
 *
 * \param c      Parsing context
 * \param ident  IDENT to consider
 * \return True if IDENT is reserved, false otherwise
 */
static bool font_family_reserved(css_language *c, const css_token *ident)
{
	return ident->ilower == c->strings[SERIF] ||
		ident->ilower == c->strings[SANS_SERIF] ||
		ident->ilower == c->strings[CURSIVE] ||
		ident->ilower == c->strings[FANTASY] ||
		ident->ilower == c->strings[MONOSPACE];
}

/**
 * Convert a font-family token into a bytecode value
 *
 * \param c      Parsing context
 * \param token  Token to consider
 * \return Bytecode value
 */
static uint16_t font_family_value(css_language *c, const css_token *token)
{
	uint16_t value;

	if (token->type == CSS_TOKEN_IDENT) {
		if (token->ilower == c->strings[SERIF])
			value = FONT_FAMILY_SERIF;
		else if (token->ilower == c->strings[SANS_SERIF])
			value = FONT_FAMILY_SANS_SERIF;
		else if (token->ilower == c->strings[CURSIVE])
			value = FONT_FAMILY_CURSIVE;
		else if (token->ilower == c->strings[FANTASY])
			value = FONT_FAMILY_FANTASY;
		else if (token->ilower == c->strings[MONOSPACE])
			value = FONT_FAMILY_MONOSPACE;
		else
			value = FONT_FAMILY_IDENT_LIST;
	} else {
		value = FONT_FAMILY_STRING;
	}

	return value;
}

/**
 * Parse font-family
 *
 * \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_font_family(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;
	uint32_t required_size = sizeof(opv);
	int temp_ctx = *ctx;
	uint8_t *ptr;

	/* [ IDENT+ | STRING ] [ ',' [ IDENT+ | STRING ] ]* | IDENT(inherit)
	 * 
	 * In the case of IDENT+, any whitespace between tokens is collapsed to
	 * a single space
	 *
	 * \todo Mozilla makes the comma optional. 
	 * Perhaps this is a quirk we should inherit?
	 */

	/* Pass 1: validate input and calculate space */
	token = parserutils_vector_iterate(vector, &temp_ctx);
	if (token == NULL || (token->type != CSS_TOKEN_IDENT &&
			token->type != CSS_TOKEN_STRING)) {
		*ctx = orig_ctx;
		return CSS_INVALID;
	}

	if (token->type == CSS_TOKEN_IDENT &&
			token->ilower == c->strings[INHERIT]) {
		flags = FLAG_INHERIT;
	} else {
		uint32_t list_size;

		value = font_family_value(c, token);

		error = comma_list_length(c, vector, &temp_ctx,
				token, font_family_reserved, &list_size);
		if (error != CSS_OK) {
			*ctx = orig_ctx;
			return error;
		}

		required_size += list_size;
	}

	opv = buildOPV(CSS_PROP_FONT_FAMILY, flags, value);

	/* Allocate result */
	error = css_stylesheet_style_create(c->sheet, required_size, result);
	if (error != CSS_OK) {
		*ctx = orig_ctx;
		return error;
	}

	/* Copy OPV to bytecode */
	ptr = (*result)->bytecode;
	memcpy(ptr, &opv, sizeof(opv));
	ptr += sizeof(opv);

	/* Pass 2: populate bytecode */
	token = parserutils_vector_iterate(vector, ctx);
	if (token == NULL || (token->type != CSS_TOKEN_IDENT &&
			token->type != CSS_TOKEN_STRING)) {
		css_stylesheet_style_destroy(c->sheet, *result);
		*result = NULL;
		*ctx = orig_ctx;
		return CSS_INVALID;
	}

	if (token->type == CSS_TOKEN_IDENT &&
			token->ilower == c->strings[INHERIT]) {
		/* Nothing to do */
	} else {
		error = comma_list_to_bytecode(c, vector, ctx, token,
				font_family_reserved, font_family_value,
				&ptr);
		if (error != CSS_OK) {
			css_stylesheet_style_destroy(c->sheet, *result);
			*result = NULL;
			*ctx = orig_ctx;
			return error;
		}

		/* Write terminator */
		opv = FONT_FAMILY_END;
		memcpy(ptr, &opv, sizeof(opv));
		ptr += sizeof(opv);
	}

	return CSS_OK;
}

/**
 * Parse font-size
 *
 * \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_font_size(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;

	/* length | percentage | IDENT(xx-small, x-small, small, medium,
	 * large, x-large, xx-large, larger, smaller, inherit) */
	token = parserutils_vector_peek(vector, *ctx);
	if (token == NULL) {
		*ctx = orig_ctx;
		return CSS_INVALID;
	}

	if (token->type == CSS_TOKEN_IDENT &&
			token->ilower == c->strings[INHERIT]) {
		parserutils_vector_iterate(vector, ctx);
		flags = FLAG_INHERIT;
	} else if (token->type == CSS_TOKEN_IDENT &&
			token->ilower == c->strings[XX_SMALL]) {
		parserutils_vector_iterate(vector, ctx);
		value = FONT_SIZE_XX_SMALL;
	} else if (token->type == CSS_TOKEN_IDENT &&
			token->ilower == c->strings[X_SMALL]) {
		parserutils_vector_iterate(vector, ctx);
		value = FONT_SIZE_X_SMALL;
	} else if (token->type == CSS_TOKEN_IDENT &&
			token->ilower == c->strings[SMALL]) {
		parserutils_vector_iterate(vector, ctx);
		value = FONT_SIZE_SMALL;
	} else if (token->type == CSS_TOKEN_IDENT &&
			token->ilower == c->strings[MEDIUM]) {
		parserutils_vector_iterate(vector, ctx);
		value = FONT_SIZE_MEDIUM;
	} else if (token->type == CSS_TOKEN_IDENT &&
			token->ilower == c->strings[LARGE]) {
		parserutils_vector_iterate(vector, ctx);
		value = FONT_SIZE_LARGE;
	} else if (token->type == CSS_TOKEN_IDENT &&
			token->ilower == c->strings[X_LARGE]) {
		parserutils_vector_iterate(vector, ctx);
		value = FONT_SIZE_X_LARGE;
	} else if (token->type == CSS_TOKEN_IDENT &&
			token->ilower == c->strings[XX_LARGE]) {
		parserutils_vector_iterate(vector, ctx);
		value = FONT_SIZE_XX_LARGE;
	} else if (token->type == CSS_TOKEN_IDENT &&
			token->ilower == c->strings[LARGER]) {
		parserutils_vector_iterate(vector, ctx);
		value = FONT_SIZE_LARGER;
	} else if (token->type == CSS_TOKEN_IDENT &&
			token->ilower == c->strings[SMALLER]) {
		parserutils_vector_iterate(vector, ctx);
		value = FONT_SIZE_SMALLER;
	} 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) {
			*ctx = orig_ctx;
			return CSS_INVALID;
		}

		/* Negative values are not permitted */
		if (length < 0) {
			*ctx = orig_ctx;
			return CSS_INVALID;
		}

		value = FONT_SIZE_DIMENSION;
	}

	opv = buildOPV(CSS_PROP_FONT_SIZE, flags, value);

	required_size = sizeof(opv);
	if ((flags & FLAG_INHERIT) == false && value == FONT_SIZE_DIMENSION)
		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 == FONT_SIZE_DIMENSION) {
		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;
}

/**
 * Parse font-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 parse_font_style(css_language *c, 
		const parserutils_vector *vector, int *ctx, 
		css_style **result)
{
	int orig_ctx = *ctx;
	css_error error;
	const css_token *ident;
	uint8_t flags = 0;
	uint16_t value = 0;
	uint32_t opv;

	/* IDENT (normal, italic, oblique, inherit) */
	ident = parserutils_vector_iterate(vector, ctx);
	if (ident == NULL || ident->type != CSS_TOKEN_IDENT) {
		*ctx = orig_ctx;
		return CSS_INVALID;
	}

	if (ident->ilower == c->strings[INHERIT]) {
		flags |= FLAG_INHERIT;
	} else if (ident->ilower == c->strings[NORMAL]) {
		value = FONT_STYLE_NORMAL;
	} else if (ident->ilower == c->strings[ITALIC]) {
		value = FONT_STYLE_ITALIC;
	} else if (ident->ilower == c->strings[OBLIQUE]) {
		value = FONT_STYLE_OBLIQUE;
	} else {
		*ctx = orig_ctx;
		return CSS_INVALID;
	}

	opv = buildOPV(CSS_PROP_FONT_STYLE, flags, value);

	/* Allocate result */
	error = css_stylesheet_style_create(c->sheet, sizeof(opv), result);
	if (error != CSS_OK) {
		*ctx = orig_ctx;
		return error;
	}

	/* Copy the bytecode to it */
	memcpy((*result)->bytecode, &opv, sizeof(opv));

	return CSS_OK;
}

/**
 * Parse font-variant
 *
 * \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_font_variant(css_language *c, 
		const parserutils_vector *vector, int *ctx, 
		css_style **result)
{
	int orig_ctx = *ctx;
	css_error error;
	const css_token *ident;
	uint8_t flags = 0;
	uint16_t value = 0;
	uint32_t opv;

	/* IDENT (normal, small-caps, inherit) */
	ident = parserutils_vector_iterate(vector, ctx);
	if (ident == NULL || ident->type != CSS_TOKEN_IDENT) {
		*ctx = orig_ctx;
		return CSS_INVALID;
	}

	if (ident->ilower == c->strings[INHERIT]) {
		flags |= FLAG_INHERIT;
	} else if (ident->ilower == c->strings[NORMAL]) {
		value = FONT_VARIANT_NORMAL;
	} else if (ident->ilower == c->strings[SMALL_CAPS]) {
		value = FONT_VARIANT_SMALL_CAPS;
	} else {
		*ctx = orig_ctx;
		return CSS_INVALID;
	}

	opv = buildOPV(CSS_PROP_FONT_VARIANT, flags, value);

	/* Allocate result */
	error = css_stylesheet_style_create(c->sheet, sizeof(opv), result);
	if (error != CSS_OK) {
		*ctx = orig_ctx;
		return error;
	}

	/* Copy the bytecode to it */
	memcpy((*result)->bytecode, &opv, sizeof(opv));

	return CSS_OK;
}

/**
 * Parse font-weight
 *
 * \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_font_weight(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;

	/* NUMBER (100, 200, 300, 400, 500, 600, 700, 800, 900) | 
	 * IDENT (normal, bold, bolder, lighter, inherit) */
	token = parserutils_vector_iterate(vector, ctx);
	if (token == NULL || (token->type != CSS_TOKEN_IDENT &&
			token->type != CSS_TOKEN_NUMBER)) {
		*ctx = orig_ctx;
		return CSS_INVALID;
	}

	if (token->ilower == c->strings[INHERIT]) {
		flags |= FLAG_INHERIT;
	} else if (token->type == CSS_TOKEN_NUMBER) {
		size_t consumed = 0;
		css_fixed num = number_from_lwc_string(token->ilower, 
				true, &consumed);
		/* Invalid if there are trailing characters */
		if (consumed != lwc_string_length(token->ilower)) {
			*ctx = orig_ctx;
			return CSS_INVALID;
		}

		switch (FIXTOINT(num)) {
		case 100: value = FONT_WEIGHT_100; break;
		case 200: value = FONT_WEIGHT_200; break;
		case 300: value = FONT_WEIGHT_300; break;
		case 400: value = FONT_WEIGHT_400; break;
		case 500: value = FONT_WEIGHT_500; break;
		case 600: value = FONT_WEIGHT_600; break;
		case 700: value = FONT_WEIGHT_700; break;
		case 800: value = FONT_WEIGHT_800; break;
		case 900: value = FONT_WEIGHT_900; break;
		default: *ctx = orig_ctx; return CSS_INVALID;
		}
	} else if (token->ilower == c->strings[NORMAL]) {
		value = FONT_WEIGHT_NORMAL;
	} else if (token->ilower == c->strings[BOLD]) {
		value = FONT_WEIGHT_BOLD;
	} else if (token->ilower == c->strings[BOLDER]) {
		value = FONT_WEIGHT_BOLDER;
	} else if (token->ilower == c->strings[LIGHTER]) {
		value = FONT_WEIGHT_LIGHTER;
	} else {
		*ctx = orig_ctx;
		return CSS_INVALID;
	}

	opv = buildOPV(CSS_PROP_FONT_WEIGHT, flags, value);

	/* Allocate result */
	error = css_stylesheet_style_create(c->sheet, sizeof(opv), result);
	if (error != CSS_OK) {
		*ctx = orig_ctx;
		return error;
	}

	/* Copy the bytecode to it */
	memcpy((*result)->bytecode, &opv, sizeof(opv));

	return CSS_OK;
}