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213 lines
6.8 KiB
213 lines
6.8 KiB
var Spaces = require('../../options/format').Spaces;
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var Marker = require('../../tokenizer/marker');
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var formatPosition = require('../../utils/format-position');
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var CASE_ATTRIBUTE_PATTERN = /[\s"'][iI]\s*\]/;
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var CASE_RESTORE_PATTERN = /([\d\w])([iI])\]/g;
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var DOUBLE_QUOTE_CASE_PATTERN = /="([a-zA-Z][a-zA-Z\d\-_]+)"([iI])/g;
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var DOUBLE_QUOTE_PATTERN = /="([a-zA-Z][a-zA-Z\d\-_]+)"(\s|\])/g;
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var HTML_COMMENT_PATTERN = /^(?:(?:<!--|-->)\s*)+/;
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var SINGLE_QUOTE_CASE_PATTERN = /='([a-zA-Z][a-zA-Z\d\-_]+)'([iI])/g;
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var SINGLE_QUOTE_PATTERN = /='([a-zA-Z][a-zA-Z\d\-_]+)'(\s|\])/g;
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var RELATION_PATTERN = /[>\+~]/;
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var WHITESPACE_PATTERN = /\s/;
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var ASTERISK_PLUS_HTML_HACK = '*+html ';
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var ASTERISK_FIRST_CHILD_PLUS_HTML_HACK = '*:first-child+html ';
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var LESS_THAN = '<';
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function hasInvalidCharacters(value) {
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var isEscaped;
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var isInvalid = false;
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var character;
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var isQuote = false;
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var i, l;
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for (i = 0, l = value.length; i < l; i++) {
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character = value[i];
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if (isEscaped) {
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// continue as always
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} else if (character == Marker.SINGLE_QUOTE || character == Marker.DOUBLE_QUOTE) {
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isQuote = !isQuote;
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} else if (!isQuote && (character == Marker.CLOSE_CURLY_BRACKET || character == Marker.EXCLAMATION || character == LESS_THAN || character == Marker.SEMICOLON)) {
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isInvalid = true;
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break;
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} else if (!isQuote && i === 0 && RELATION_PATTERN.test(character)) {
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isInvalid = true;
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break;
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}
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isEscaped = character == Marker.BACK_SLASH;
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}
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return isInvalid;
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}
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function removeWhitespace(value, format) {
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var stripped = [];
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var character;
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var isNewLineNix;
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var isNewLineWin;
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var isEscaped;
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var wasEscaped;
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var isQuoted;
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var isSingleQuoted;
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var isDoubleQuoted;
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var isAttribute;
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var isRelation;
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var isWhitespace;
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var roundBracketLevel = 0;
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var wasRelation = false;
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var wasWhitespace = false;
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var withCaseAttribute = CASE_ATTRIBUTE_PATTERN.test(value);
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var spaceAroundRelation = format && format.spaces[Spaces.AroundSelectorRelation];
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var i, l;
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for (i = 0, l = value.length; i < l; i++) {
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character = value[i];
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isNewLineNix = character == Marker.NEW_LINE_NIX;
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isNewLineWin = character == Marker.NEW_LINE_NIX && value[i - 1] == Marker.CARRIAGE_RETURN;
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isQuoted = isSingleQuoted || isDoubleQuoted;
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isRelation = !isAttribute && !isEscaped && roundBracketLevel === 0 && RELATION_PATTERN.test(character);
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isWhitespace = WHITESPACE_PATTERN.test(character);
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if (wasEscaped && isQuoted && isNewLineWin) {
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// swallow escaped new windows lines in comments
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stripped.pop();
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stripped.pop();
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} else if (isEscaped && isQuoted && isNewLineNix) {
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// swallow escaped new *nix lines in comments
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stripped.pop();
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} else if (isEscaped) {
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stripped.push(character);
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} else if (character == Marker.OPEN_SQUARE_BRACKET && !isQuoted) {
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stripped.push(character);
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isAttribute = true;
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} else if (character == Marker.CLOSE_SQUARE_BRACKET && !isQuoted) {
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stripped.push(character);
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isAttribute = false;
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} else if (character == Marker.OPEN_ROUND_BRACKET && !isQuoted) {
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stripped.push(character);
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roundBracketLevel++;
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} else if (character == Marker.CLOSE_ROUND_BRACKET && !isQuoted) {
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stripped.push(character);
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roundBracketLevel--;
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} else if (character == Marker.SINGLE_QUOTE && !isQuoted) {
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stripped.push(character);
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isSingleQuoted = true;
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} else if (character == Marker.DOUBLE_QUOTE && !isQuoted) {
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stripped.push(character);
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isDoubleQuoted = true;
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} else if (character == Marker.SINGLE_QUOTE && isQuoted) {
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stripped.push(character);
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isSingleQuoted = false;
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} else if (character == Marker.DOUBLE_QUOTE && isQuoted) {
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stripped.push(character);
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isDoubleQuoted = false;
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} else if (isWhitespace && wasRelation && !spaceAroundRelation) {
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continue;
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} else if (!isWhitespace && wasRelation && spaceAroundRelation) {
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stripped.push(Marker.SPACE);
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stripped.push(character);
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} else if (isWhitespace && (isAttribute || roundBracketLevel > 0) && !isQuoted) {
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// skip space
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} else if (isWhitespace && wasWhitespace && !isQuoted) {
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// skip extra space
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} else if ((isNewLineWin || isNewLineNix) && (isAttribute || roundBracketLevel > 0) && isQuoted) {
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// skip newline
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} else if (isRelation && wasWhitespace && !spaceAroundRelation) {
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stripped.pop();
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stripped.push(character);
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} else if (isRelation && !wasWhitespace && spaceAroundRelation) {
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stripped.push(Marker.SPACE);
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stripped.push(character);
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} else if (isWhitespace) {
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stripped.push(Marker.SPACE);
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} else {
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stripped.push(character);
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}
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wasEscaped = isEscaped;
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isEscaped = character == Marker.BACK_SLASH;
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wasRelation = isRelation;
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wasWhitespace = isWhitespace;
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}
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return withCaseAttribute ?
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stripped.join('').replace(CASE_RESTORE_PATTERN, '$1 $2]') :
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stripped.join('');
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}
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function removeQuotes(value) {
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if (value.indexOf('\'') == -1 && value.indexOf('"') == -1) {
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return value;
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}
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return value
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.replace(SINGLE_QUOTE_CASE_PATTERN, '=$1 $2')
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.replace(SINGLE_QUOTE_PATTERN, '=$1$2')
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.replace(DOUBLE_QUOTE_CASE_PATTERN, '=$1 $2')
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.replace(DOUBLE_QUOTE_PATTERN, '=$1$2');
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}
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function tidyRules(rules, removeUnsupported, adjacentSpace, format, warnings) {
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var list = [];
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var repeated = [];
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function removeHTMLComment(rule, match) {
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warnings.push('HTML comment \'' + match + '\' at ' + formatPosition(rule[2][0]) + '. Removing.');
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return '';
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}
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for (var i = 0, l = rules.length; i < l; i++) {
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var rule = rules[i];
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var reduced = rule[1];
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reduced = reduced.replace(HTML_COMMENT_PATTERN, removeHTMLComment.bind(null, rule));
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if (hasInvalidCharacters(reduced)) {
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warnings.push('Invalid selector \'' + rule[1] + '\' at ' + formatPosition(rule[2][0]) + '. Ignoring.');
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continue;
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}
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reduced = removeWhitespace(reduced, format);
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reduced = removeQuotes(reduced);
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if (adjacentSpace && reduced.indexOf('nav') > 0) {
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reduced = reduced.replace(/\+nav(\S|$)/, '+ nav$1');
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}
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if (removeUnsupported && reduced.indexOf(ASTERISK_PLUS_HTML_HACK) > -1) {
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continue;
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}
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if (removeUnsupported && reduced.indexOf(ASTERISK_FIRST_CHILD_PLUS_HTML_HACK) > -1) {
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continue;
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}
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if (reduced.indexOf('*') > -1) {
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reduced = reduced
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.replace(/\*([:#\.\[])/g, '$1')
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.replace(/^(\:first\-child)?\+html/, '*$1+html');
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}
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if (repeated.indexOf(reduced) > -1) {
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continue;
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}
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rule[1] = reduced;
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repeated.push(reduced);
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list.push(rule);
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}
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if (list.length == 1 && list[0][1].length === 0) {
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warnings.push('Empty selector \'' + list[0][1] + '\' at ' + formatPosition(list[0][2][0]) + '. Ignoring.');
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list = [];
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}
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return list;
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}
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module.exports = tidyRules;
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