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var sortSelectors = require('./sort-selectors');
var tidyRules = require('./tidy-rules');
var tidyBlock = require('./tidy-block');
var tidyAtRule = require('./tidy-at-rule');
var Hack = require('../hack');
var removeUnused = require('../remove-unused');
var restoreFromOptimizing = require('../restore-from-optimizing');
var wrapForOptimizing = require('../wrap-for-optimizing').all;
var configuration = require('../configuration');
var optimizers = require('./value-optimizers');
var OptimizationLevel = require('../../options/optimization-level').OptimizationLevel;
var Token = require('../../tokenizer/token');
var Marker = require('../../tokenizer/marker');
var formatPosition = require('../../utils/format-position');
var serializeRules = require('../../writer/one-time').rules;
var CHARSET_TOKEN = '@charset';
var CHARSET_REGEXP = new RegExp('^' + CHARSET_TOKEN, 'i');
var DEFAULT_ROUNDING_PRECISION = require('../../options/rounding-precision').DEFAULT;
var PROPERTY_NAME_PATTERN = /^(?:\-chrome\-|\-[\w\-]+\w|\w[\w\-]+\w|\w{1,}|\-\-\S+)$/;
var IMPORT_PREFIX_PATTERN = /^@import/i;
var URL_PREFIX_PATTERN = /^url\(/i;
var VARIABLE_NAME_PATTERN = /^--\S+$/;
function startsAsUrl(value) {
return URL_PREFIX_PATTERN.test(value);
}
function isImport(token) {
return IMPORT_PREFIX_PATTERN.test(token[1]);
}
function isLegacyFilter(property) {
var value;
if (property.name == 'filter' || property.name == '-ms-filter') {
value = property.value[0][1];
return value.indexOf('progid') > -1 ||
value.indexOf('alpha') === 0 ||
value.indexOf('chroma') === 0;
} else {
return false;
}
}
function noop() {}
function optimizeBody(rule, properties, context) {
var options = context.options;
var valueOptimizers;
var property, name, type, value;
var propertyToken;
var propertyOptimizer;
var serializedRule = serializeRules(rule);
var _properties = wrapForOptimizing(properties);
var pluginValueOptimizers = context.options.plugins.level1Value;
var pluginPropertyOptimizers = context.options.plugins.level1Property;
var i, l;
propertyLoop:
for (i = 0, l = _properties.length; i < l; i++) {
var j, k, m, n;
property = _properties[i];
name = property.name;
propertyOptimizer = configuration[name] && configuration[name].propertyOptimizer || noop;
valueOptimizers = configuration[name] && configuration[name].valueOptimizers || [optimizers.whiteSpace];
if (!PROPERTY_NAME_PATTERN.test(name)) {
propertyToken = property.all[property.position];
context.warnings.push('Invalid property name \'' + name + '\' at ' + formatPosition(propertyToken[1][2][0]) + '. Ignoring.');
property.unused = true;
continue;
}
if (property.value.length === 0) {
propertyToken = property.all[property.position];
context.warnings.push('Empty property \'' + name + '\' at ' + formatPosition(propertyToken[1][2][0]) + '. Ignoring.');
property.unused = true;
continue;
}
if (property.hack && (
(property.hack[0] == Hack.ASTERISK || property.hack[0] == Hack.UNDERSCORE) && !options.compatibility.properties.iePrefixHack ||
property.hack[0] == Hack.BACKSLASH && !options.compatibility.properties.ieSuffixHack ||
property.hack[0] == Hack.BANG && !options.compatibility.properties.ieBangHack)) {
property.unused = true;
continue;
}
if (!options.compatibility.properties.ieFilters && isLegacyFilter(property)) {
property.unused = true;
continue;
}
if (property.block) {
optimizeBody(rule, property.value[0][1], context);
continue;
}
if (VARIABLE_NAME_PATTERN.test(name)) {
continue;
}
valuesLoop:
for (j = 0, m = property.value.length; j < m; j++) {
type = property.value[j][0];
value = property.value[j][1];
if (type == Token.PROPERTY_BLOCK) {
property.unused = true;
context.warnings.push('Invalid value token at ' + formatPosition(value[0][1][2][0]) + '. Ignoring.');
break;
}
if (startsAsUrl(value) && !context.validator.isUrl(value)) {
property.unused = true;
context.warnings.push('Broken URL \'' + value + '\' at ' + formatPosition(property.value[j][2][0]) + '. Ignoring.');
break;
}
for (k = 0, n = valueOptimizers.length; k < n; k++) {
value = valueOptimizers[k](name, value, options);
}
for (k = 0, n = pluginValueOptimizers.length; k < n; k++) {
value = pluginValueOptimizers[k](name, value, options);
}
property.value[j][1] = value;
}
propertyOptimizer(serializedRule, property, options);
for (j = 0, m = pluginPropertyOptimizers.length; j < m; j++) {
pluginPropertyOptimizers[j](serializedRule, property, options);
}
}
restoreFromOptimizing(_properties);
removeUnused(_properties);
removeComments(properties, options);
}
function removeComments(tokens, options) {
var token;
var i;
for (i = 0; i < tokens.length; i++) {
token = tokens[i];
if (token[0] != Token.COMMENT) {
continue;
}
optimizeComment(token, options);
if (token[1].length === 0) {
tokens.splice(i, 1);
i--;
}
}
}
function optimizeComment(token, options) {
if (token[1][2] == Marker.EXCLAMATION && (options.level[OptimizationLevel.One].specialComments == 'all' || options.commentsKept < options.level[OptimizationLevel.One].specialComments)) {
options.commentsKept++;
return;
}
token[1] = [];
}
function cleanupCharsets(tokens) {
var hasCharset = false;
for (var i = 0, l = tokens.length; i < l; i++) {
var token = tokens[i];
if (token[0] != Token.AT_RULE)
continue;
if (!CHARSET_REGEXP.test(token[1]))
continue;
if (hasCharset || token[1].indexOf(CHARSET_TOKEN) == -1) {
tokens.splice(i, 1);
i--;
l--;
} else {
hasCharset = true;
tokens.splice(i, 1);
tokens.unshift([Token.AT_RULE, token[1].replace(CHARSET_REGEXP, CHARSET_TOKEN)]);
}
}
}
function buildUnitRegexp(options) {
var units = ['px', 'em', 'ex', 'cm', 'mm', 'in', 'pt', 'pc', '%'];
var otherUnits = ['ch', 'rem', 'vh', 'vm', 'vmax', 'vmin', 'vw'];
otherUnits.forEach(function (unit) {
if (options.compatibility.units[unit]) {
units.push(unit);
}
});
return new RegExp('(^|\\s|\\(|,)0(?:' + units.join('|') + ')(\\W|$)', 'g');
}
function buildPrecisionOptions(roundingPrecision) {
var precisionOptions = {
matcher: null,
units: {},
};
var optimizable = [];
var unit;
var value;
for (unit in roundingPrecision) {
value = roundingPrecision[unit];
if (value != DEFAULT_ROUNDING_PRECISION) {
precisionOptions.units[unit] = {};
precisionOptions.units[unit].value = value;
precisionOptions.units[unit].multiplier = Math.pow(10, value);
optimizable.push(unit);
}
}
if (optimizable.length > 0) {
precisionOptions.enabled = true;
precisionOptions.decimalPointMatcher = new RegExp('(\\d)\\.($|' + optimizable.join('|') + ')($|\W)', 'g');
precisionOptions.zeroMatcher = new RegExp('(\\d*)(\\.\\d+)(' + optimizable.join('|') + ')', 'g');
}
return precisionOptions;
}
function level1Optimize(tokens, context) {
var options = context.options;
var levelOptions = options.level[OptimizationLevel.One];
var ie7Hack = options.compatibility.selectors.ie7Hack;
var adjacentSpace = options.compatibility.selectors.adjacentSpace;
var spaceAfterClosingBrace = options.compatibility.properties.spaceAfterClosingBrace;
var format = options.format;
var mayHaveCharset = false;
var afterRules = false;
options.unitsRegexp = options.unitsRegexp || buildUnitRegexp(options);
options.precision = options.precision || buildPrecisionOptions(levelOptions.roundingPrecision);
options.commentsKept = options.commentsKept || 0;
for (var i = 0, l = tokens.length; i < l; i++) {
var token = tokens[i];
switch (token[0]) {
case Token.AT_RULE:
token[1] = isImport(token) && afterRules ? '' : token[1];
token[1] = levelOptions.tidyAtRules ? tidyAtRule(token[1]) : token[1];
mayHaveCharset = true;
break;
case Token.AT_RULE_BLOCK:
optimizeBody(token[1], token[2], context);
afterRules = true;
break;
case Token.NESTED_BLOCK:
token[1] = levelOptions.tidyBlockScopes ? tidyBlock(token[1], spaceAfterClosingBrace) : token[1];
level1Optimize(token[2], context);
afterRules = true;
break;
case Token.COMMENT:
optimizeComment(token, options);
break;
case Token.RULE:
token[1] = levelOptions.tidySelectors ? tidyRules(token[1], !ie7Hack, adjacentSpace, format, context.warnings) : token[1];
token[1] = token[1].length > 1 ? sortSelectors(token[1], levelOptions.selectorsSortingMethod) : token[1];
optimizeBody(token[1], token[2], context);
afterRules = true;
break;
}
if (token[0] == Token.COMMENT && token[1].length === 0 || levelOptions.removeEmpty && (token[1].length === 0 || (token[2] && token[2].length === 0))) {
tokens.splice(i, 1);
i--;
l--;
}
}
if (levelOptions.cleanupCharsets && mayHaveCharset) {
cleanupCharsets(tokens);
}
return tokens;
}
module.exports = level1Optimize;