var less, tree;
if (typeof environment === "object" && ({}).toString.call(environment) === "[object Environment]") {
// Rhino
// Details on how to detect Rhino: https://github.com/ringo/ringojs/issues/88
less = {};
tree = less.tree = {};
less.mode = 'rhino';
} else if (typeof(window) === 'undefined') {
// Node.js
less = exports,
tree = require('./tree');
less.mode = 'node';
} else {
// Browser
if (typeof(window.less) === 'undefined') { window.less = {} }
less = window.less,
tree = window.less.tree = {};
less.mode = 'browser';
}
//
// 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;
var that = this;
// This function is called after all files
// have been imported through `@import`.
var finish = function () {};
var imports = this.imports = {
paths: env && env.paths || [], // Search paths, when importing
queue: [], // Files which haven't been imported yet
files: {}, // Holds the imported parse trees
mime: env && env.mime, // MIME type of .less files
push: function (path, callback) {
var that = this;
this.queue.push(path);
//
// Import a file asynchronously
//
less.Parser.importer(path, this.paths, function (root) {
that.queue.splice(that.queue.indexOf(path), 1); // Remove the path from the queue
that.files[path] = root; // Store the root
callback(root);
if (that.queue.length === 0) { finish() } // Call `finish` if we're done importing
}, 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;
}
}
//
// Parse from a token, regexp or string, and move forward if match
//
function $(tok) {
var match, args, length, c, index, endIndex, k, mem;
//
// 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) {
mem = i += length;
endIndex = i + chunks[j].length - length;
while (i < endIndex) {
c = input.charCodeAt(i);
if (! (c === 32 || c === 10 || c === 9)) { break }
i++;
}
chunks[j] = chunks[j].slice(length + (i - mem));
current = i;
if (chunks[j].length === 0 && j < chunks.length - 1) { j++ }
if(typeof(match) === 'string') {
return match;
} else {
return match.length === 1 ? match[0] : match;
}
}
}
// 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 {
if (tok.test(chunks[j])) {
return true;
} else {
return false;
}
}
}
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;
this.env.filename = this.env.filename || null;
//
// 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, start, end, zone, line, lines, buff = [], c, error = null;
i = j = current = furthest = 0;
chunks = [];
input = str.replace(/\r\n/g, '\n');
// Split the input into chunks.
chunks = (function (chunks) {
var j = 0,
skip = /[^"'`\{\}\/\(\)]+/g,
comment = /\/\*(?:[^*]|\*+[^\/*])*\*+\/|\/\/.*/g,
level = 0,
match,
chunk = chunks[0],
inParam,
inString;
for (var i = 0, c, cc; i < input.length; i++) {
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 = i;
if (!inString && !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]);
c = input.charAt(i);
}
}
}
}
if (c === '{' && !inString && !inParam) { level ++;
chunk.push(c);
} else if (c === '}' && !inString && !inParam) { level --;
chunk.push(c);
chunks[++j] = chunk = [];
} else if (c === '(' && !inString && !inParam) {
chunk.push(c);
inParam = true;
} else if (c === ')' && !inString && inParam) {
chunk.push(c);
inParam = false;
} else {
if (c === '"' || c === "'" || c === '`') {
if (! inString) {
inString = c;
} else {
inString = inString === c ? false : inString;
}
}
chunk.push(c);
}
}
if (level > 0) {
throw {
type: 'Syntax',
message: "Missing closing `}`",
filename: env.filename
};
}
return chunks.map(function (c) { return c.join('') });;
})([[]]);
// 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.
root = new(tree.Ruleset)([], $(this.parsers.primary));
root.root = true;
root.toCSS = (function (evaluate) {
var line, lines, column;
return function (options, variables) {
var frames = [];
options = 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, 0);
});
frames = [new(tree.Ruleset)(null, variables)];
}
try {
var css = evaluate.call(this, { frames: frames })
.toCSS([], { compress: options.compress || false });
} catch (e) {
lines = input.split('\n');
line = getLine(e.index);
for (var n = e.index, column = -1;
n >= 0 && input.charAt(n) !== '\n';
n--) { column++ }
throw {
type: e.type,
message: e.message,
filename: env.filename,
index: e.index,
line: typeof(line) === 'number' ? line + 1 : null,
callLine: e.call && (getLine(e.call) + 1),
callExtract: lines[getLine(e.call)],
stack: e.stack,
column: column,
extract: [
lines[line - 1],
lines[line],
lines[line + 1]
]
};
}
if (options.compress) {
return css.replace(/(\s)+/g, "$1");
} else {
return css;
}
function getLine(index) {
return index ? (input.slice(0, index).match(/\n/g) || "").length : null;
}
};
})(root.eval);
// If `i` is smaller than the `input.length - 1`,
// it means the parser wasn't able to parse the whole
// string, so we've got a parsing error.
//
// We try to extract a \n delimited string,
// showing the line where the parse error occured.
// We split it up into two parts (the part which parsed,
// and the part which didn't), so we can color them differently.
if (i < input.length - 1) {
i = furthest;
lines = input.split('\n');
line = (input.slice(0, i).match(/\n/g) || "").length + 1;
for (var n = i, column = -1; n >= 0 && input.charAt(n) !== '\n'; n--) { column++ }
error = {
name: "ParseError",
message: "Syntax Error on line " + line,
index: i,
filename: env.filename,
line: line,
column: column,
extract: [
lines[line - 2],
lines[line - 1],
lines[line]
]
};
}
if (this.imports.queue.length > 0) {
finish = function () { callback(error, root) };
} else {
callback(error, root);
}
},
//
// Here in, the parsing rules/functions
//
// The basic structure of the syntax tree generated is as follows:
//
// Ruleset -> Rule -> Value -> Expression -> Entity
//
// Here's some LESS code:
//
// .class {
// color: #fff;
// border: 1px solid #000;
// width: @w + 4px;
// > .child {...}
// }
//
// And here's what the parse tree might look like:
//
// Ruleset (Selector '.class', [
// Rule ("color", Value ([Expression [Color #fff]]))
// Rule ("border", Value ([Expression [Dimension 1px][Keyword "solid"][Color #000]]))
// Rule ("width", Value ([Expression [Operation "+" [Variable "@w"][Dimension 4px]]]))
// Ruleset (Selector [Element '>', '.child'], [...])
// ])
//
// In general, most rules will try to parse a token with the `$()` 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.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);
} else if (comment = $(/^\/\*(?:[^*]|\*+[^\/*])*\*+\/\n?/)) {
return new(tree.Comment)(comment);
}
},
//
// 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;
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);
}
},
//
// A catch-all word, such as:
//
// black border-collapse
//
keyword: function () {
var k;
if (k = $(/^[_A-Za-z-][_A-Za-z0-9-]*/)) { 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, args, index = i;
if (! (name = /^([\w-]+|%|progid:[\w\.]+)\(/.exec(chunks[j]))) return;
name = name[1].toLowerCase();
if (name === 'url') { return null }
else { i += name.length }
if (name === 'alpha') { return $(this.alpha) }
$('('); // Parse the '(' and consume whitespace.
args = $(this.entities.arguments);
if (! $(')')) return;
if (name) { return new(tree.Call)(name, args, index) }
},
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);
},
// 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) ||
$(this.entities.dataURI) || $(/^[-\w%@$\/.&=:;#+?~]+/) || "";
if (! $(')')) throw new(Error)("missing closing ) for url()");
return new(tree.URL)((value.value || value.data || value instanceof tree.Variable)
? value : new(tree.Anonymous)(value), imports.paths);
},
dataURI: function () {
var obj;
if ($(/^data:/)) {
obj = {};
obj.mime = $(/^[^\/]+\/[^,;)]+/) || '';
obj.charset = $(/^;\s*charset=[^,;)]+/) || '';
obj.base64 = $(/^;\s*base64/) || '';
obj.data = $(/^,\s*[^)]+/);
if (obj.data) { return obj }
}
},
//
// 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);
}
},
//
// 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);
if ((c > 57 || c < 45) || c === 47) return;
if (value = $(/^(-?\d*\.?\d+)(px|%|em|pc|ex|in|deg|s|ms|pt|cm|mm|rad|grad|turn)?/)) {
return new(tree.Dimension)(value[1], value[2]);
}
},
//
// 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 }
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] }
},
//
// A font size/line-height shorthand
//
// small/12px
//
// We need to peek first, or we'll match on keywords and dimensions
//
shorthand: function () {
var a, b;
if (! peek(/^[@\w.%-]+\/[@\w.-]+/)) return;
if ((a = $(this.entity)) && $('/') && (b = $(this.entity))) {
return new(tree.Shorthand)(a, b);
}
},
//
// 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);
if (s !== '.' && s !== '#') { return }
while (e = $(/^[#.](?:[\w-]|\\(?:[a-fA-F0-9]{1,6} ?|[^a-fA-F0-9]))+/)) {
elements.push(new(tree.Element)(c, e, i));
c = $('>');
}
$('(') && (args = $(this.entities.arguments)) && $(')');
if (elements.length > 0 && ($(';') || peek('}'))) {
return new(tree.mixin.Call)(elements, args, index);
}
},
//
// 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, param, value;
if ((input.charAt(i) !== '.' && input.charAt(i) !== '#') ||
peek(/^[^{]*(;|})/)) return;
if (match = $(/^([#.](?:[\w-]|\\(?:[a-fA-F0-9]{1,6} ?|[^a-fA-F0-9]))+)\s*\(/)) {
name = match[1];
while (param = $(this.entities.variable) || $(this.entities.literal)
|| $(this.entities.keyword)) {
// Variable
if (param instanceof tree.Variable) {
if ($(':')) {
if (value = $(this.expression)) {
params.push({ name: param.name, value: value });
} else {
throw new(Error)("Expected value");
}
} else {
params.push({ name: param.name });
}
} else {
params.push({ value: param });
}
if (! $(',')) { break }
}
if (! $(')')) throw new(Error)("Expected )");
ruleset = $(this.block);
if (ruleset) {
return new(tree.mixin.Definition)(name, params, ruleset);
}
}
}
},
//
// 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)) {
if (! $(')')) throw new(Error)("missing closing ) for alpha()");
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, t, c;
c = $(this.combinator);
e = $(/^(?:\d+\.\d+|\d+)%/) || $(/^(?:[.#]?|:*)(?:[\w-]|\\(?:[a-fA-F0-9]{1,6} ?|[^a-fA-F0-9]))+/) ||
$('*') || $(this.attribute) || $(/^\([^)@]+\)/);
if (e) { return new(tree.Element)(c, e, i) }
if (c.value && c.value.charAt(0) === '&') {
return new(tree.Element)(c, null, i);
}
},
//
// 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 match, c = input.charAt(i);
if (c === '>' || c === '+' || c === '~') {
i++;
while (input.charAt(i) === ' ') { i++ }
return new(tree.Combinator)(c);
} else if (c === '&') {
match = '&';
i++;
if(input.charAt(i) === ' ') {
match = '& ';
}
while (input.charAt(i) === ' ') { i++ }
return new(tree.Combinator)(match);
} else if (c === ':' && input.charAt(i + 1) === ':') {
i += 2;
while (input.charAt(i) === ' ') { i++ }
return new(tree.Combinator)('::');
} else if (input.charAt(i - 1) === ' ') {
return new(tree.Combinator)(" ");
} else {
return new(tree.Combinator)(null);
}
},
//
// A CSS Selector
//
// .class > div + h1
// li a:hover
//
// Selectors are made out of one or more Elements, see above.
//
selector: function () {
var sel, e, elements = [], c, match;
while (e = $(this.element)) {
c = input.charAt(i);
elements.push(e)
if (c === '{' || c === '}' || c === ';' || c === ',') { break }
}
if (elements.length > 0) { return new(tree.Selector)(elements) }
},
tag: function () {
return $(/^[a-zA-Z][a-zA-Z-]*[0-9]?/) || $('*');
},
attribute: function () {
var attr = '', key, val, op;
if (! $('[')) return;
if (key = $(/^[a-zA-Z-]+/) || $(this.entities.quoted)) {
if ((op = $(/^[|~*$^]?=/)) &&
(val = $(this.entities.quoted) || $(/^[\w-]+/))) {
attr = [key, op, val.toCSS ? val.toCSS() : val].join('');
} else { attr = key }
}
if (! $(']')) return;
if (attr) { return "[" + attr + "]" }
},
//
// The `block` rule is used by `ruleset` and `mixin.definition`.
// It's a wrapper around the `primary` rule, with added `{}`.
//
block: function () {
var content;
if ($('{') && (content = $(this.primary)) && $('}')) {
return content;
}
},
//
// div, .class, body > p {...}
//
ruleset: function () {
var selectors = [], s, rules, match;
save();
while (s = $(this.selector)) {
selectors.push(s);
$(this.comment);
if (! $(',')) { break }
$(this.comment);
}
if (selectors.length > 0 && (rules = $(this.block))) {
return new(tree.Ruleset)(selectors, rules);
} else {
// Backtrack
furthest = i;
restore();
}
},
rule: function () {
var name, value, c = input.charAt(i), important, match;
save();
if (c === '.' || c === '#' || c === '&') { return }
if (name = $(this.variable) || $(this.property)) {
if ((name.charAt(0) != '@') && (match = /^([^@+\/'"*`(;{}-]*);/.exec(chunks[j]))) {
i += match[0].length - 1;
value = new(tree.Anonymous)(match[1]);
} else if (name === "font") {
value = $(this.font);
} else {
value = $(this.value);
}
important = $(this.important);
if (value && $(this.end)) {
return new(tree.Rule)(name, value, important, memo);
} else {
furthest = i;
restore();
}
}
},
//
// An @import directive
//
// @import "lib";
//
// Depending on our environemnt, importing is done differently:
// In the browser, it's an XHR request, in Node, it would be a
// file-system operation. The function used for importing is
// stored in `import`, which we pass to the Import constructor.
//
"import": function () {
var path;
if ($(/^@import\s+/) &&
(path = $(this.entities.quoted) || $(this.entities.url)) &&
$(';')) {
return new(tree.Import)(path, imports);
}
},
//
// A CSS Directive
//
// @charset "utf-8";
//
directive: function () {
var name, value, rules, types;
if (input.charAt(i) !== '@') return;
if (value = $(this['import'])) {
return value;
} else if (name = $(/^@media|@page/) || $(/^@(?:-webkit-|-moz-|-o-)[a-z0-9-]+/) || $('keyframes')) {
types = ($(/^[^{]+/) || '').trim();
if (rules = $(this.block)) {
return new(tree.Directive)(name + " " + types, rules);
}
} else if (name = $(/^@[-a-z]+/)) {
if (name === '@font-face') {
if (rules = $(this.block)) {
return new(tree.Directive)(name, rules);
}
} else if ((value = $(this.entity)) && $(';')) {
return new(tree.Directive)(name, value);
}
}
},
font: function () {
var value = [], expression = [], weight, shorthand, font, e;
while (e = $(this.shorthand) || $(this.entity)) {
expression.push(e);
}
value.push(new(tree.Expression)(expression));
if ($(',')) {
while (e = $(this.expression)) {
value.push(e);
if (! $(',')) { break }
}
}
return new(tree.Value)(value);
},
//
// A Value is a comma-delimited list of Expressions
//
// font-family: Baskerville, Georgia, serif;
//
// In a Rule, a Value represents everything after the `:`,
// and before the `;`.
//
value: function () {
var e, expressions = [], important;
while (e = $(this.expression)) {
expressions.push(e);
if (! $(',')) { break }
}
if (expressions.length > 0) {
return new(tree.Value)(expressions);
}
},
important: function () {
if (input.charAt(i) === '!') {
return $(/^! *important/);
}
},
sub: function () {
var e;
if ($('(') && (e = $(this.expression)) && $(')')) {
return e;
}
},
multiplication: function () {
var m, a, op, operation;
if (m = $(this.operand)) {
while ((op = ($('/') || $('*'))) && (a = $(this.operand))) {
operation = new(tree.Operation)(op, [operation || m, a]);
}
return operation || m;
}
},
addition: function () {
var m, a, op, operation;
if (m = $(this.multiplication)) {
while ((op = $(/^[-+]\s+/) || (input.charAt(i - 1) != ' ' && ($('+') || $('-')))) &&
(a = $(this.multiplication))) {
operation = new(tree.Operation)(op, [operation || m, a]);
}
return operation || m;
}
},
//
// An operand is anything that can be part of an operation,
// such as a Color, or a Variable
//
operand: function () {
var negate, p = input.charAt(i + 1);
if (input.charAt(i) === '-' && (p === '@' || p === '(')) { negate = $('-') }
var o = $(this.sub) || $(this.entities.dimension) ||
$(this.entities.color) || $(this.entities.variable) ||
$(this.entities.call);
return negate ? new(tree.Operation)('*', [new(tree.Dimension)(-1), o])
: o;
},
//
// Expressions either represent mathematical operations,
// or white-space delimited Entities.
//
// 1px solid black
// @var * 2
//
expression: function () {
var e, delim, entities = [], d;
while (e = $(this.addition) || $(this.entity)) {
entities.push(e);
}
if (entities.length > 0) {
return new(tree.Expression)(entities);
}
},
property: function () {
var name;
if (name = $(/^(\*?-?[-a-z_0-9]+)\s*:/)) {
return name[1];
}
}
}
};
};
if (less.mode === 'browser' || less.mode === 'rhino') {
//
// Used by `@import` directives
//
less.Parser.importer = function (path, paths, callback, env) {
if (path.charAt(0) !== '/' && paths.length > 0) {
path = paths[0] + path;
}
// We pass `true` as 3rd argument, to force the reload of the import.
// This is so we can get the syntax tree as opposed to just the CSS output,
// as we need this to evaluate the current stylesheet.
loadStyleSheet({ href: path, title: path, type: env.mime }, callback, true);
};
}