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JavaScript
/*!
* LESS - Leaner CSS v1.5.0
* http://lesscss.org
*
* Copyright (c) 2009-2013, Alexis Sellier <self@cloudhead.net>
* Licensed under the Apache v2 License.
*
* @licence
*/
(function (window, undefined) {//
// Stub out `require` in the browser
//
function require(arg) {
return window.less[arg.split('/')[1]];
};
if (typeof(window.less) === 'undefined' || typeof(window.less.nodeType) !== 'undefined') { window.less = {}; }
less = window.less;
tree = window.less.tree = {};
less.mode = 'browser';
var less, tree;
// Node.js does not have a header file added which defines less
if (less === undefined) {
less = exports;
tree = require('./tree');
less.mode = 'node';
}
//
// less.js - parser
//
// A relatively straight-forward predictive parser.
// There is no tokenization/lexing stage, the input is parsed
// in one sweep.
//
// To make the parser fast enough to run in the browser, several
// optimization had to be made:
//
// - Matching and slicing on a huge input is often cause of slowdowns.
// The solution is to chunkify the input into smaller strings.
// The chunks are stored in the `chunks` var,
// `j` holds the current chunk index, and `current` holds
// the index of the current chunk in relation to `input`.
// This gives us an almost 4x speed-up.
//
// - In many cases, we don't need to match individual tokens;
// for example, if a value doesn't hold any variables, operations
// or dynamic references, the parser can effectively 'skip' it,
// treating it as a literal.
// An example would be '1px solid #000' - which evaluates to itself,
// we don't need to know what the individual components are.
// The drawback, of course is that you don't get the benefits of
// syntax-checking on the CSS. This gives us a 50% speed-up in the parser,
// and a smaller speed-up in the code-gen.
//
//
// Token matching is done with the `$` function, which either takes
// a terminal string or regexp, or a non-terminal function to call.
// It also takes care of moving all the indices forwards.
//
//
less.Parser = function Parser(env) {
var input, // LeSS input string
i, // current index in `input`
j, // current chunk
temp, // temporarily holds a chunk's state, for backtracking
memo, // temporarily holds `i`, when backtracking
furthest, // furthest index the parser has gone to
chunks, // chunkified input
current, // index of current chunk, in `input`
parser,
rootFilename = env && env.filename;
// Top parser on an import tree must be sure there is one "env"
// which will then be passed around by reference.
if (!(env instanceof tree.parseEnv)) {
env = new tree.parseEnv(env);
}
var imports = this.imports = {
paths: env.paths || [], // Search paths, when importing
queue: [], // Files which haven't been imported yet
files: env.files, // Holds the imported parse trees
contents: env.contents, // Holds the imported file contents
mime: env.mime, // MIME type of .less files
error: null, // Error in parsing/evaluating an import
push: function (path, currentFileInfo, importOptions, callback) {
var parserImports = this;
this.queue.push(path);
var fileParsedFunc = function (e, root, fullPath) {
parserImports.queue.splice(parserImports.queue.indexOf(path), 1); // Remove the path from the queue
var importedPreviously = fullPath in parserImports.files || fullPath === rootFilename;
parserImports.files[fullPath] = root; // Store the root
if (e && !parserImports.error) { parserImports.error = e; }
callback(e, root, importedPreviously, fullPath);
};
if (less.Parser.importer) {
less.Parser.importer(path, currentFileInfo, fileParsedFunc, env);
} else {
less.Parser.fileLoader(path, currentFileInfo, function(e, contents, fullPath, newFileInfo) {
if (e) {fileParsedFunc(e); return;}
var newEnv = new tree.parseEnv(env);
newEnv.currentFileInfo = newFileInfo;
newEnv.processImports = false;
newEnv.contents[fullPath] = contents;
if (currentFileInfo.reference || importOptions.reference) {
newFileInfo.reference = true;
}
if (importOptions.inline) {
fileParsedFunc(null, contents, fullPath);
} else {
new(less.Parser)(newEnv).parse(contents, function (e, root) {
fileParsedFunc(e, root, fullPath);
});
}
}, env);
}
}
};
function save() { temp = chunks[j], memo = i, current = i; }
function restore() { chunks[j] = temp, i = memo, current = i; }
function sync() {
if (i > current) {
chunks[j] = chunks[j].slice(i - current);
current = i;
}
}
function isWhitespace(c) {
// Could change to \s?
var code = c.charCodeAt(0);
return code === 32 || code === 10 || code === 9;
}
//
// Parse from a token, regexp or string, and move forward if match
//
function $(tok) {
var match, length;
//
// Non-terminal
//
if (tok instanceof Function) {
return tok.call(parser.parsers);
//
// Terminal
//
// Either match a single character in the input,
// or match a regexp in the current chunk (chunk[j]).
//
} else if (typeof(tok) === 'string') {
match = input.charAt(i) === tok ? tok : null;
length = 1;
sync ();
} else {
sync ();
if (match = tok.exec(chunks[j])) {
length = match[0].length;
} else {
return null;
}
}
// The match is confirmed, add the match length to `i`,
// and consume any extra white-space characters (' ' || '\n')
// which come after that. The reason for this is that LeSS's
// grammar is mostly white-space insensitive.
//
if (match) {
skipWhitespace(length);
if(typeof(match) === 'string') {
return match;
} else {
return match.length === 1 ? match[0] : match;
}
}
}
function skipWhitespace(length) {
var oldi = i, oldj = j,
endIndex = i + chunks[j].length,
mem = i += length;
while (i < endIndex) {
if (! isWhitespace(input.charAt(i))) { break; }
i++;
}
chunks[j] = chunks[j].slice(length + (i - mem));
current = i;
if (chunks[j].length === 0 && j < chunks.length - 1) { j++; }
return oldi !== i || oldj !== j;
}
function expect(arg, msg) {
var result = $(arg);
if (! result) {
error(msg || (typeof(arg) === 'string' ? "expected '" + arg + "' got '" + input.charAt(i) + "'"
: "unexpected token"));
} else {
return result;
}
}
function error(msg, type) {
var e = new Error(msg);
e.index = i;
e.type = type || 'Syntax';
throw e;
}
// Same as $(), but don't change the state of the parser,
// just return the match.
function peek(tok) {
if (typeof(tok) === 'string') {
return input.charAt(i) === tok;
} else {
return tok.test(chunks[j]);
}
}
function getInput(e, env) {
if (e.filename && env.currentFileInfo.filename && (e.filename !== env.currentFileInfo.filename)) {
return parser.imports.contents[e.filename];
} else {
return input;
}
}
function getLocation(index, inputStream) {
var n = index + 1,
line = null,
column = -1;
while (--n >= 0 && inputStream.charAt(n) !== '\n') {
column++;
}
if (typeof index === 'number') {
line = (inputStream.slice(0, index).match(/\n/g) || "").length;
}
return {
line: line,
column: column
};
}
function getDebugInfo(index, inputStream, env) {
var filename = env.currentFileInfo.filename;
if(less.mode !== 'browser' && less.mode !== 'rhino') {
filename = require('path').resolve(filename);
}
return {
lineNumber: getLocation(index, inputStream).line + 1,
fileName: filename
};
}
function LessError(e, env) {
var input = getInput(e, env),
loc = getLocation(e.index, input),
line = loc.line,
col = loc.column,
callLine = e.call && getLocation(e.call, input).line,
lines = input.split('\n');
this.type = e.type || 'Syntax';
this.message = e.message;
this.filename = e.filename || env.currentFileInfo.filename;
this.index = e.index;
this.line = typeof(line) === 'number' ? line + 1 : null;
this.callLine = callLine + 1;
this.callExtract = lines[callLine];
this.stack = e.stack;
this.column = col;
this.extract = [
lines[line - 1],
lines[line],
lines[line + 1]
];
}
LessError.prototype = new Error();
LessError.prototype.constructor = LessError;
this.env = env = env || {};
// The optimization level dictates the thoroughness of the parser,
// the lower the number, the less nodes it will create in the tree.
// This could matter for debugging, or if you want to access
// the individual nodes in the tree.
this.optimization = ('optimization' in this.env) ? this.env.optimization : 1;
//
// The Parser
//
return parser = {
imports: imports,
//
// Parse an input string into an abstract syntax tree,
// call `callback` when done.
//
parse: function (str, callback) {
var root, line, lines, error = null;
i = j = current = furthest = 0;
input = str.replace(/\r\n/g, '\n');
// Remove potential UTF Byte Order Mark
input = input.replace(/^\uFEFF/, '');
parser.imports.contents[env.currentFileInfo.filename] = input;
// Split the input into chunks.
chunks = (function (chunks) {
var j = 0,
skip = /(?:@\{[\w-]+\}|[^"'`\{\}\/\(\)\\])+/g,
comment = /\/\*(?:[^*]|\*+[^\/*])*\*+\/|\/\/.*/g,
string = /"((?:[^"\\\r\n]|\\.)*)"|'((?:[^'\\\r\n]|\\.)*)'|`((?:[^`]|\\.)*)`/g,
level = 0,
match,
chunk = chunks[0],
inParam;
for (var i = 0, c, cc; i < input.length;) {
skip.lastIndex = i;
if (match = skip.exec(input)) {
if (match.index === i) {
i += match[0].length;
chunk.push(match[0]);
}
}
c = input.charAt(i);
comment.lastIndex = string.lastIndex = i;
if (match = string.exec(input)) {
if (match.index === i) {
i += match[0].length;
chunk.push(match[0]);
continue;
}
}
if (!inParam && c === '/') {
cc = input.charAt(i + 1);
if (cc === '/' || cc === '*') {
if (match = comment.exec(input)) {
if (match.index === i) {
i += match[0].length;
chunk.push(match[0]);
continue;
}
}
}
}
switch (c) {
case '{':
if (!inParam) {
level++;
chunk.push(c);
break;
}
/* falls through */
case '}':
if (!inParam) {
level--;
chunk.push(c);
chunks[++j] = chunk = [];
break;
}
/* falls through */
case '(':
if (!inParam) {
inParam = true;
chunk.push(c);
break;
}
/* falls through */
case ')':
if (inParam) {
inParam = false;
chunk.push(c);
break;
}
/* falls through */
default:
chunk.push(c);
}
i++;
}
if (level !== 0) {
error = new(LessError)({
index: i-1,
type: 'Parse',
message: (level > 0) ? "missing closing `}`" : "missing opening `{`",
filename: env.currentFileInfo.filename
}, env);
}
return chunks.map(function (c) { return c.join(''); });
})([[]]);
if (error) {
return callback(new(LessError)(error, env));
}
// Start with the primary rule.
// The whole syntax tree is held under a Ruleset node,
// with the `root` property set to true, so no `{}` are
// output. The callback is called when the input is parsed.
try {
root = new(tree.Ruleset)([], $(this.parsers.primary));
root.root = true;
root.firstRoot = true;
} catch (e) {
return callback(new(LessError)(e, env));
}
root.toCSS = (function (evaluate) {
return function (options, variables) {
options = options || {};
var evaldRoot,
css,
evalEnv = new tree.evalEnv(options);
//
// Allows setting variables with a hash, so:
//
// `{ color: new(tree.Color)('#f01') }` will become:
//
// new(tree.Rule)('@color',
// new(tree.Value)([
// new(tree.Expression)([
// new(tree.Color)('#f01')
// ])
// ])
// )
//
if (typeof(variables) === 'object' && !Array.isArray(variables)) {
variables = Object.keys(variables).map(function (k) {
var value = variables[k];
if (! (value instanceof tree.Value)) {
if (! (value instanceof tree.Expression)) {
value = new(tree.Expression)([value]);
}
value = new(tree.Value)([value]);
}
return new(tree.Rule)('@' + k, value, false, null, 0);
});
evalEnv.frames = [new(tree.Ruleset)(null, variables)];
}
try {
evaldRoot = evaluate.call(this, evalEnv);
new(tree.joinSelectorVisitor)()
.run(evaldRoot);
new(tree.processExtendsVisitor)()
.run(evaldRoot);
new(tree.toCSSVisitor)({compress: Boolean(options.compress)})
.run(evaldRoot);
if (options.sourceMap) {
evaldRoot = new tree.sourceMapOutput(
{
writeSourceMap: options.writeSourceMap,
rootNode: evaldRoot,
contentsMap: parser.imports.contents,
sourceMapFilename: options.sourceMapFilename,
outputFilename: options.sourceMapOutputFilename,
sourceMapBasepath: options.sourceMapBasepath,
sourceMapRootpath: options.sourceMapRootpath,
outputSourceFiles: options.outputSourceFiles,
sourceMapGenerator: options.sourceMapGenerator
});
}
css = evaldRoot.toCSS({
compress: Boolean(options.compress),
dumpLineNumbers: env.dumpLineNumbers,
strictUnits: Boolean(options.strictUnits)});
} catch (e) {
throw new(LessError)(e, env);
}
if (options.cleancss && less.mode === 'node') {
return require('clean-css').process(css);
} else if (options.compress) {
return css.replace(/(^(\s)+)|((\s)+$)/g, "");
} else {
return css;
}
};
})(root.eval);
// If `i` is smaller than the `input.length - 1`,
// it means the parser wasn't able to parse the whole
// string, so we've got a parsing error.
//
// We try to extract a \n delimited string,
// showing the line where the parse error occured.
// We split it up into two parts (the part which parsed,
// and the part which didn't), so we can color them differently.
if (i < input.length - 1) {
i = furthest;
var loc = getLocation(i, input);
lines = input.split('\n');
line = loc.line + 1;
error = {
type: "Parse",
message: "Unrecognised input",
index: i,
filename: env.currentFileInfo.filename,
line: line,
column: loc.column,
extract: [
lines[line - 2],
lines[line - 1],
lines[line]
]
};
}
var finish = function (e) {
e = error || e || parser.imports.error;
if (e) {
if (!(e instanceof LessError)) {
e = new(LessError)(e, env);
}
return callback(e);
}
else {
return callback(null, root);
}
};
if (env.processImports !== false) {
new tree.importVisitor(this.imports, finish)
.run(root);
} else {
return finish();
}
},
//
// Here in, the parsing rules/functions
//
// The basic structure of the syntax tree generated is as follows:
//
// Ruleset -> Rule -> Value -> Expression -> Entity
//
// Here's some LESS code:
//
// .class {
// color: #fff;
// border: 1px solid #000;
// width: @w + 4px;
// > .child {...}
// }
//
// And here's what the parse tree might look like:
//
// Ruleset (Selector '.class', [
// Rule ("color", Value ([Expression [Color #fff]]))
// Rule ("border", Value ([Expression [Dimension 1px][Keyword "solid"][Color #000]]))
// Rule ("width", Value ([Expression [Operation "+" [Variable "@w"][Dimension 4px]]]))
// Ruleset (Selector [Element '>', '.child'], [...])
// ])
//
// In general, most rules will try to parse a token with the `$()` function, and if the return
// value is truly, will return a new node, of the relevant type. Sometimes, we need to check
// first, before parsing, that's when we use `peek()`.
//
parsers: {
//
// The `primary` rule is the *entry* and *exit* point of the parser.
// The rules here can appear at any level of the parse tree.
//
// The recursive nature of the grammar is an interplay between the `block`
// rule, which represents `{ ... }`, the `ruleset` rule, and this `primary` rule,
// as represented by this simplified grammar:
//
// primary → (ruleset | rule)+
// ruleset → selector+ block
// block → '{' primary '}'
//
// Only at one point is the primary rule not called from the
// block rule: at the root level.
//
primary: function () {
var node, root = [];
while ((node = $(this.extendRule) || $(this.mixin.definition) || $(this.rule) || $(this.ruleset) ||
$(this.mixin.call) || $(this.comment) || $(this.directive))
|| $(/^[\s\n]+/) || $(/^;+/)) {
node && root.push(node);
}
return root;
},
// We create a Comment node for CSS comments `/* */`,
// but keep the LeSS comments `//` silent, by just skipping
// over them.
comment: function () {
var comment;
if (input.charAt(i) !== '/') { return; }
if (input.charAt(i + 1) === '/') {
return new(tree.Comment)($(/^\/\/.*/), true, i, env.currentFileInfo);
} else if (comment = $(/^\/\*(?:[^*]|\*+[^\/*])*\*+\/\n?/)) {
return new(tree.Comment)(comment, false, i, env.currentFileInfo);
}
},
comments: function () {
var comment, comments = [];
while(comment = $(this.comment)) {
comments.push(comment);
}
return comments;
},
//
// Entities are tokens which can be found inside an Expression
//
entities: {
//
// A string, which supports escaping " and '
//
// "milky way" 'he\'s the one!'
//
quoted: function () {
var str, j = i, e, index = i;
if (input.charAt(j) === '~') { j++, e = true; } // Escaped strings
if (input.charAt(j) !== '"' && input.charAt(j) !== "'") { return; }
e && $('~');
if (str = $(/^"((?:[^"\\\r\n]|\\.)*)"|'((?:[^'\\\r\n]|\\.)*)'/)) {
return new(tree.Quoted)(str[0], str[1] || str[2], e, index, env.currentFileInfo);
}
},
//
// A catch-all word, such as:
//
// black border-collapse
//
keyword: function () {
var k;
if (k = $(/^[_A-Za-z-][_A-Za-z0-9-]*/)) {
var color = tree.Color.fromKeyword(k);
if (color) {
return color;
}
return new(tree.Keyword)(k);
}
},
//
// A function call
//
// rgb(255, 0, 255)
//
// We also try to catch IE's `alpha()`, but let the `alpha` parser
// deal with the details.
//
// The arguments are parsed with the `entities.arguments` parser.
//
call: function () {
var name, nameLC, args, alpha_ret, index = i;
if (! (name = /^([\w-]+|%|progid:[\w\.]+)\(/.exec(chunks[j]))) { return; }
name = name[1];
nameLC = name.toLowerCase();
if (nameLC === 'url') { return null; }
else { i += name.length; }
if (nameLC === 'alpha') {
alpha_ret = $(this.alpha);
if(typeof alpha_ret !== 'undefined') {
return alpha_ret;
}
}
$('('); // Parse the '(' and consume whitespace.
args = $(this.entities.arguments);
if (! $(')')) {
return;
}
if (name) { return new(tree.Call)(name, args, index, env.currentFileInfo); }
},
arguments: function () {
var args = [], arg;
while (arg = $(this.entities.assignment) || $(this.expression)) {
args.push(arg);
if (! $(',')) {
break;
}
}
return args;
},
literal: function () {
return $(this.entities.dimension) ||
$(this.entities.color) ||
$(this.entities.quoted) ||
$(this.entities.unicodeDescriptor);
},
// Assignments are argument entities for calls.
// They are present in ie filter properties as shown below.
//
// filter: progid:DXImageTransform.Microsoft.Alpha( *opacity=50* )
//
assignment: function () {
var key, value;
if ((key = $(/^\w+(?=\s?=)/i)) && $('=') && (value = $(this.entity))) {
return new(tree.Assignment)(key, value);
}
},
//
// Parse url() tokens
//
// We use a specific rule for urls, because they don't really behave like
// standard function calls. The difference is that the argument doesn't have
// to be enclosed within a string, so it can't be parsed as an Expression.
//
url: function () {
var value;
if (input.charAt(i) !== 'u' || !$(/^url\(/)) {
return;
}
value = $(this.entities.quoted) || $(this.entities.variable) ||
$(/^(?:(?:\\[\(\)'"])|[^\(\)'"])+/) || "";
expect(')');
/*jshint eqnull:true */
return new(tree.URL)((value.value != null || value instanceof tree.Variable)
? value : new(tree.Anonymous)(value), env.currentFileInfo);
},
//
// A Variable entity, such as `@fink`, in
//
// width: @fink + 2px
//
// We use a different parser for variable definitions,
// see `parsers.variable`.
//
variable: function () {
var name, index = i;
if (input.charAt(i) === '@' && (name = $(/^@@?[\w-]+/))) {
return new(tree.Variable)(name, index, env.currentFileInfo);
}
},
// A variable entity useing the protective {} e.g. @{var}
variableCurly: function () {
var curly, index = i;
if (input.charAt(i) === '@' && (curly = $(/^@\{([\w-]+)\}/))) {
return new(tree.Variable)("@" + curly[1], index, env.currentFileInfo);
}
},
//
// A Hexadecimal color
//
// #4F3C2F
//
// `rgb` and `hsl` colors are parsed through the `entities.call` parser.
//
color: function () {
var rgb;
if (input.charAt(i) === '#' && (rgb = $(/^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/))) {
return new(tree.Color)(rgb[1]);
}
},
//
// A Dimension, that is, a number and a unit
//
// 0.5em 95%
//
dimension: function () {
var value, c = input.charCodeAt(i);
//Is the first char of the dimension 0-9, '.', '+' or '-'
if ((c > 57 || c < 43) || c === 47 || c == 44) {
return;
}
if (value = $(/^([+-]?\d*\.?\d+)(%|[a-z]+)?/)) {
return new(tree.Dimension)(value[1], value[2]);
}
},
//
// A unicode descriptor, as is used in unicode-range
//
// U+0?? or U+00A1-00A9
//
unicodeDescriptor: function () {
var ud;
if (ud = $(/^U\+[0-9a-fA-F?]+(\-[0-9a-fA-F?]+)?/)) {
return new(tree.UnicodeDescriptor)(ud[0]);
}
},
//
// JavaScript code to be evaluated
//
// `window.location.href`
//
javascript: function () {
var str, j = i, e;
if (input.charAt(j) === '~') { j++; e = true; } // Escaped strings
if (input.charAt(j) !== '`') { return; }
if (env.javascriptEnabled !== undefined && !env.javascriptEnabled) {
error("You are using JavaScript, which has been disabled.");
}
if (e) { $('~'); }
if (str = $(/^`([^`]*)`/)) {
return new(tree.JavaScript)(str[1], i, e);
}
}
},
//
// The variable part of a variable definition. Used in the `rule` parser
//
// @fink:
//
variable: function () {
var name;
if (input.charAt(i) === '@' && (name = $(/^(@[\w-]+)\s*:/))) { return name[1]; }
},
//
// extend syntax - used to extend selectors
//
extend: function(isRule) {
var elements, e, index = i, option, extendList = [];
if (!$(isRule ? /^&:extend\(/ : /^:extend\(/)) { return; }
do {
option = null;
elements = [];
while (true) {
option = $(/^(all)(?=\s*(\)|,))/);
if (option) { break; }
e = $(this.element);
if (!e) { break; }
elements.push(e);
}
option = option && option[1];
extendList.push(new(tree.Extend)(new(tree.Selector)(elements), option, index));
} while($(","));
expect(/^\)/);
if (isRule) {
expect(/^;/);
}
return extendList;
},
//
// extendRule - used in a rule to extend all the parent selectors
//
extendRule: function() {
return this.extend(true);
},
//
// Mixins
//
mixin: {
//
// A Mixin call, with an optional argument list
//
// #mixins > .square(#fff);
// .rounded(4px, black);
// .button;
//
// The `while` loop is there because mixins can be
// namespaced, but we only support the child and descendant
// selector for now.
//
call: function () {
var elements = [], e, c, args, index = i, s = input.charAt(i), important = false;
if (s !== '.' && s !== '#') { return; }
save(); // stop us absorbing part of an invalid selector
while (e = $(/^[#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/)) {
elements.push(new(tree.Element)(c, e, i, env.currentFileInfo));
c = $('>');
}
if ($('(')) {
args = this.mixin.args.call(this, true).args;
expect(')');
}
args = args || [];
if ($(this.important)) {
important = true;
}
if (elements.length > 0 && ($(';') || peek('}'))) {
return new(tree.mixin.Call)(elements, args, index, env.currentFileInfo, important);
}
restore();
},
args: function (isCall) {
var expressions = [], argsSemiColon = [], isSemiColonSeperated, argsComma = [], expressionContainsNamed, name, nameLoop, value, arg,
returner = {args:null, variadic: false};
while (true) {
if (isCall) {
arg = $(this.expression);
} else {
$(this.comments);
if (input.charAt(i) === '.' && $(/^\.{3}/)) {
returner.variadic = true;
if ($(";") && !isSemiColonSeperated) {
isSemiColonSeperated = true;
}
(isSemiColonSeperated ? argsSemiColon : argsComma)
.push({ variadic: true });
break;
}
arg = $(this.entities.variable) || $(this.entities.literal)
|| $(this.entities.keyword);
}
if (!arg) {
break;
}
nameLoop = null;
if (arg.throwAwayComments) {
arg.throwAwayComments();
}
value = arg;
var val = null;
if (isCall) {
// Variable
if (arg.value.length == 1) {
val = arg.value[0];
}
} else {
val = arg;
}
if (val && val instanceof tree.Variable) {
if ($(':')) {
if (expressions.length > 0) {
if (isSemiColonSeperated) {
error("Cannot mix ; and , as delimiter types");
}
expressionContainsNamed = true;
}
value = expect(this.expression);
nameLoop = (name = val.name);
} else if (!isCall && $(/^\.{3}/)) {
returner.variadic = true;
if ($(";") && !isSemiColonSeperated) {
isSemiColonSeperated = true;
}
(isSemiColonSeperated ? argsSemiColon : argsComma)
.push({ name: arg.name, variadic: true });
break;
} else if (!isCall) {
name = nameLoop = val.name;
value = null;
}
}
if (value) {
expressions.push(value);
}
argsComma.push({ name:nameLoop, value:value });
if ($(',')) {
continue;
}
if ($(';') || isSemiColonSeperated) {
if (expressionContainsNamed) {
error("Cannot mix ; and , as delimiter types");
}
isSemiColonSeperated = true;
if (expressions.length > 1) {
value = new(tree.Value)(expressions);
}
argsSemiColon.push({ name:name, value:value });
name = null;
expressions = [];
expressionContainsNamed = false;
}
}
returner.args = isSemiColonSeperated ? argsSemiColon : argsComma;
return returner;
},
//
// A Mixin definition, with a list of parameters
//
// .rounded (@radius: 2px, @color) {
// ...
// }
//
// Until we have a finer grained state-machine, we have to
// do a look-ahead, to make sure we don't have a mixin call.
// See the `rule` function for more information.
//
// We start by matching `.rounded (`, and then proceed on to
// the argument list, which has optional default values.
// We store the parameters in `params`, with a `value` key,
// if there is a value, such as in the case of `@radius`.
//
// Once we've got our params list, and a closing `)`, we parse
// the `{...}` block.
//
definition: function () {
var name, params = [], match, ruleset, cond, variadic = false;
if ((input.charAt(i) !== '.' && input.charAt(i) !== '#') ||
peek(/^[^{]*\}/)) {
return;
}
save();
if (match = $(/^([#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+)\s*\(/)) {
name = match[1];
var argInfo = this.mixin.args.call(this, false);
params = argInfo.args;
variadic = argInfo.variadic;
// .mixincall("@{a}");
// looks a bit like a mixin definition.. so we have to be nice and restore
if (!$(')')) {
furthest = i;
restore();
}
$(this.comments);
if ($(/^when/)) { // Guard
cond = expect(this.conditions, 'expected condition');
}
ruleset = $(this.block);
if (ruleset) {
return new(tree.mixin.Definition)(name, params, ruleset, cond, variadic);
} else {
restore();
}
}
}
},
//
// Entities are the smallest recognized token,
// and can be found inside a rule's value.
//
entity: function () {
return $(this.entities.literal) || $(this.entities.variable) || $(this.entities.url) ||
$(this.entities.call) || $(this.entities.keyword) ||$(this.entities.javascript) ||
$(this.comment);
},
//
// A Rule terminator. Note that we use `peek()` to check for '}',
// because the `block` rule will be expecting it, but we still need to make sure
// it's there, if ';' was ommitted.
//
end: function () {
return $(';') || peek('}');
},
//
// IE's alpha function
//
// alpha(opacity=88)
//
alpha: function () {
var value;
if (! $(/^\(opacity=/i)) { return; }
if (value = $(/^\d+/) || $(this.entities.variable)) {
expect(')');
return new(tree.Alpha)(value);
}
},
//
// A Selector Element
//
// div
// + h1
// #socks
// input[type="text"]
//
// Elements are the building blocks for Selectors,
// they are made out of a `Combinator` (see combinator rule),
// and an element name, such as a tag a class, or `*`.
//
element: function () {
var e, c, v;
c = $(this.combinator);
e = $(/^(?:\d+\.\d+|\d+)%/) || $(/^(?:[.#]?|:*)(?:[\w-]|[^\x00-\x9f]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/) ||
$('*') || $('&') || $(this.attribute) || $(/^\([^()@]+\)/) || $(/^[\.#](?=@)/) || $(this.entities.variableCurly);
if (! e) {
if ($('(')) {
if ((v = ($(this.selector))) &&
$(')')) {
e = new(tree.Paren)(v);
}
}
}
if (e) { return new(tree.Element)(c, e, i, env.currentFileInfo); }
},
//
// Combinators combine elements together, in a Selector.
//
// Because our parser isn't white-space sensitive, special care
// has to be taken, when parsing the descendant combinator, ` `,
// as it's an empty space. We have to check the previous character
// in the input, to see if it's a ` ` character. More info on how
// we deal with this in *combinator.js*.
//
combinator: function () {
var c = input.charAt(i);
if (c === '>' || c === '+' || c === '~' || c === '|') {
i++;
while (input.charAt(i).match(/\s/)) { i++; }
return new(tree.Combinator)(c);
} else if (input.charAt(i - 1).match(/\s/)) {
return new(tree.Combinator)(" ");
} else {
return new(tree.Combinator)(null);
}
},
//
// A CSS selector (see selector below)
// with less extensions e.g. the ability to extend and guard
//
lessSelector: function () {
return this.selector(true);
},
//
// A CSS Selector
//
// .class > div + h1
// li a:hover
//
// Selectors are made out of one or more Elements, see above.
//
selector: function (isLess) {
var e, elements = [], c, extend, extendList = [], when, condition;
while ((isLess && (extend = $(this.extend))) || (isLess && (when = $(/^when/))) || (e = $(this.element))) {
if (when) {
condition = expect(this.conditions, 'expected condition');
} else if (condition) {
error("CSS guard can only be used at the end of selector");
} else if (extend) {
extendList.push.apply(extendList, extend);
} else {
if (extendList.length) {
error("Extend can only be used at the end of selector");
}
c = input.charAt(i);
elements.push(e);
e = null;
}
if (c === '{' || c === '}' || c === ';' || c === ',' || c === ')') {
break;
}
}
if (elements.length > 0) { return new(tree.Selector)(elements, extendList, condition, i, env.currentFileInfo); }
if (extendList.length) { error("Extend must be used to extend a selector, it cannot be used on its own"); }
},
attribute: function () {
var key, val, op;
if (! $('[')) { return; }
if (!(key = $(this.entities.variableCurly))) {
key = expect(/^(?:[_A-Za-z0-9-\*]*\|)?(?:[_A-Za-z0-9-]|\\.)+/);
}
if ((op = $(/^[|~*$^]?=/))) {
val = $(this.entities.quoted) || $(/^[0-9]+%/) || $(/^[\w-]+/) || $(this.entities.variableCurly);
}
expect(']');
return new(tree.Attribute)(key, op, val);
},
//
// The `block` rule is used by `ruleset` and `mixin.definition`.
// It's a wrapper around the `primary` rule, with added `{}`.
//
block: function () {
var content;
if ($('{') && (content = $(this.primary)) && $('}')) {
return content;
}
},
//
// div, .class, body > p {...}
//
ruleset: function () {
var selectors = [], s, rules, debugInfo;
save();
if (env.dumpLineNumbers) {
debugInfo = getDebugInfo(i, input, env);
}
while (s = $(this.lessSelector)) {
selectors.push(s);
$(this.comments);
if (! $(',')) { break; }
if (s.condition) {
error("Guards are only currently allowed on a single selector.");
}
$(this.comments);
}
if (selectors.length > 0 && (rules = $(this.block))) {
var ruleset = new(tree.Ruleset)(selectors, rules, env.strictImports);
if (env.dumpLineNumbers) {
ruleset.debugInfo = debugInfo;
}
return ruleset;
} else {
// Backtrack
furthest = i;
restore();
}
},
rule: function (tryAnonymous) {
var name, value, c = input.charAt(i), important, merge = false;
save();
if (c === '.' || c === '#' || c === '&') { return; }
if (name = $(this.variable) || $(this.ruleProperty)) {
// prefer to try to parse first if its a variable or we are compressing
// but always fallback on the other one
value