vue hello world项目
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var Spaces = require('../../options/format').Spaces;
var Marker = require('../../tokenizer/marker');
var formatPosition = require('../../utils/format-position');
var CASE_ATTRIBUTE_PATTERN = /[\s"'][iI]\s*\]/;
var CASE_RESTORE_PATTERN = /([\d\w])([iI])\]/g;
var DOUBLE_QUOTE_CASE_PATTERN = /="([a-zA-Z][a-zA-Z\d\-_]+)"([iI])/g;
var DOUBLE_QUOTE_PATTERN = /="([a-zA-Z][a-zA-Z\d\-_]+)"(\s|\])/g;
var HTML_COMMENT_PATTERN = /^(?:(?:<!--|-->)\s*)+/;
var SINGLE_QUOTE_CASE_PATTERN = /='([a-zA-Z][a-zA-Z\d\-_]+)'([iI])/g;
var SINGLE_QUOTE_PATTERN = /='([a-zA-Z][a-zA-Z\d\-_]+)'(\s|\])/g;
var RELATION_PATTERN = /[>\+~]/;
var WHITESPACE_PATTERN = /\s/;
var ASTERISK_PLUS_HTML_HACK = '*+html ';
var ASTERISK_FIRST_CHILD_PLUS_HTML_HACK = '*:first-child+html ';
var LESS_THAN = '<';
var PSEUDO_CLASSES_WITH_SELECTORS = [
':current',
':future',
':has',
':host',
':host-context',
':is',
':not',
':past',
':where'
];
function hasInvalidCharacters(value) {
var isEscaped;
var isInvalid = false;
var character;
var isQuote = false;
var i, l;
for (i = 0, l = value.length; i < l; i++) {
character = value[i];
if (isEscaped) {
// continue as always
} else if (character == Marker.SINGLE_QUOTE || character == Marker.DOUBLE_QUOTE) {
isQuote = !isQuote;
} else if (!isQuote && (character == Marker.CLOSE_CURLY_BRACKET || character == Marker.EXCLAMATION || character == LESS_THAN || character == Marker.SEMICOLON)) {
isInvalid = true;
break;
} else if (!isQuote && i === 0 && RELATION_PATTERN.test(character)) {
isInvalid = true;
break;
}
isEscaped = character == Marker.BACK_SLASH;
}
return isInvalid;
}
function removeWhitespace(value, format) {
var stripped = [];
var character;
var isNewLineNix;
var isNewLineWin;
var isEscaped;
var wasEscaped;
var isQuoted;
var isSingleQuoted;
var isDoubleQuoted;
var isAttribute;
var isRelation;
var isWhitespace;
var isSpaceAwarePseudoClass;
var roundBracketLevel = 0;
var wasComma = false;
var wasRelation = false;
var wasWhitespace = false;
var withCaseAttribute = CASE_ATTRIBUTE_PATTERN.test(value);
var spaceAroundRelation = format && format.spaces[Spaces.AroundSelectorRelation];
var i, l;
for (i = 0, l = value.length; i < l; i++) {
character = value[i];
isNewLineNix = character == Marker.NEW_LINE_NIX;
isNewLineWin = character == Marker.NEW_LINE_NIX && value[i - 1] == Marker.CARRIAGE_RETURN;
isQuoted = isSingleQuoted || isDoubleQuoted;
isRelation = !isAttribute && !isEscaped && roundBracketLevel === 0 && RELATION_PATTERN.test(character);
isWhitespace = WHITESPACE_PATTERN.test(character);
isSpaceAwarePseudoClass = roundBracketLevel == 1 && character == Marker.CLOSE_ROUND_BRACKET ?
false :
isSpaceAwarePseudoClass || (roundBracketLevel === 0 && character == Marker.COLON && isPseudoClassWithSelectors(value, i));
if (wasEscaped && isQuoted && isNewLineWin) {
// swallow escaped new windows lines in comments
stripped.pop();
stripped.pop();
} else if (isEscaped && isQuoted && isNewLineNix) {
// swallow escaped new *nix lines in comments
stripped.pop();
} else if (isEscaped) {
stripped.push(character);
} else if (character == Marker.OPEN_SQUARE_BRACKET && !isQuoted) {
stripped.push(character);
isAttribute = true;
} else if (character == Marker.CLOSE_SQUARE_BRACKET && !isQuoted) {
stripped.push(character);
isAttribute = false;
} else if (character == Marker.OPEN_ROUND_BRACKET && !isQuoted) {
stripped.push(character);
roundBracketLevel++;
} else if (character == Marker.CLOSE_ROUND_BRACKET && !isQuoted) {
stripped.push(character);
roundBracketLevel--;
} else if (character == Marker.SINGLE_QUOTE && !isQuoted) {
stripped.push(character);
isSingleQuoted = true;
} else if (character == Marker.DOUBLE_QUOTE && !isQuoted) {
stripped.push(character);
isDoubleQuoted = true;
} else if (character == Marker.SINGLE_QUOTE && isQuoted) {
stripped.push(character);
isSingleQuoted = false;
} else if (character == Marker.DOUBLE_QUOTE && isQuoted) {
stripped.push(character);
isDoubleQuoted = false;
} else if (isWhitespace && wasRelation && !spaceAroundRelation) {
continue;
} else if (!isWhitespace && wasRelation && spaceAroundRelation) {
stripped.push(Marker.SPACE);
stripped.push(character);
} else if (isWhitespace && !wasWhitespace && wasComma && roundBracketLevel > 0 && isSpaceAwarePseudoClass) {
// skip space
} else if (isWhitespace && !wasWhitespace && roundBracketLevel > 0 && isSpaceAwarePseudoClass) {
stripped.push(character);
} else if (isWhitespace && (isAttribute || roundBracketLevel > 0) && !isQuoted) {
// skip space
} else if (isWhitespace && wasWhitespace && !isQuoted) {
// skip extra space
} else if ((isNewLineWin || isNewLineNix) && (isAttribute || roundBracketLevel > 0) && isQuoted) {
// skip newline
} else if (isRelation && wasWhitespace && !spaceAroundRelation) {
stripped.pop();
stripped.push(character);
} else if (isRelation && !wasWhitespace && spaceAroundRelation) {
stripped.push(Marker.SPACE);
stripped.push(character);
} else if (isWhitespace) {
stripped.push(Marker.SPACE);
} else {
stripped.push(character);
}
wasEscaped = isEscaped;
isEscaped = character == Marker.BACK_SLASH;
wasRelation = isRelation;
wasWhitespace = isWhitespace;
wasComma = character == Marker.COMMA;
}
return withCaseAttribute ?
stripped.join('').replace(CASE_RESTORE_PATTERN, '$1 $2]') :
stripped.join('');
}
function isPseudoClassWithSelectors(value, colonPosition) {
var pseudoClass = value.substring(colonPosition, value.indexOf(Marker.OPEN_ROUND_BRACKET, colonPosition));
return PSEUDO_CLASSES_WITH_SELECTORS.indexOf(pseudoClass) > -1;
}
function removeQuotes(value) {
if (value.indexOf('\'') == -1 && value.indexOf('"') == -1) {
return value;
}
return value
.replace(SINGLE_QUOTE_CASE_PATTERN, '=$1 $2')
.replace(SINGLE_QUOTE_PATTERN, '=$1$2')
.replace(DOUBLE_QUOTE_CASE_PATTERN, '=$1 $2')
.replace(DOUBLE_QUOTE_PATTERN, '=$1$2');
}
function tidyRules(rules, removeUnsupported, adjacentSpace, format, warnings) {
var list = [];
var repeated = [];
function removeHTMLComment(rule, match) {
warnings.push('HTML comment \'' + match + '\' at ' + formatPosition(rule[2][0]) + '. Removing.');
return '';
}
for (var i = 0, l = rules.length; i < l; i++) {
var rule = rules[i];
var reduced = rule[1];
reduced = reduced.replace(HTML_COMMENT_PATTERN, removeHTMLComment.bind(null, rule));
if (hasInvalidCharacters(reduced)) {
warnings.push('Invalid selector \'' + rule[1] + '\' at ' + formatPosition(rule[2][0]) + '. Ignoring.');
continue;
}
reduced = removeWhitespace(reduced, format);
reduced = removeQuotes(reduced);
if (adjacentSpace && reduced.indexOf('nav') > 0) {
reduced = reduced.replace(/\+nav(\S|$)/, '+ nav$1');
}
if (removeUnsupported && reduced.indexOf(ASTERISK_PLUS_HTML_HACK) > -1) {
continue;
}
if (removeUnsupported && reduced.indexOf(ASTERISK_FIRST_CHILD_PLUS_HTML_HACK) > -1) {
continue;
}
if (reduced.indexOf('*') > -1) {
reduced = reduced
.replace(/\*([:#\.\[])/g, '$1')
.replace(/^(\:first\-child)?\+html/, '*$1+html');
}
if (repeated.indexOf(reduced) > -1) {
continue;
}
rule[1] = reduced;
repeated.push(reduced);
list.push(rule);
}
if (list.length == 1 && list[0][1].length === 0) {
warnings.push('Empty selector \'' + list[0][1] + '\' at ' + formatPosition(list[0][2][0]) + '. Ignoring.');
list = [];
}
return list;
}
module.exports = tidyRules;