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| 'use strict';
var emptyObject = {};
var type = emptyObject.toString;
var ARRAY = type.call([]);
var NUMBER = type.call(0);
var OBJECT = type.call(emptyObject);
var STRING = type.call('');
var FUNCTION = type.call(type);
var own = emptyObject.hasOwnProperty;
var freeze = Object.freeze || function(o) {return o};
function defaults(target, source) {
for (var k in source) if (own.call(source, k)) {
if (k.indexOf('$') && !(k in target)) target[k] = source[k];
}
return target
}
function cartesian(a,b) {
var res = [], i, j;
for (j in b) if(own.call(b, j))
for (i in a) if(own.call(a, i))
res.push(a[i] + b[j]);
return res
}
// "Tokenizes" the selectors into parts relevant for the next function.
// Strings and comments are matched, but ignored afterwards.
// This is not a full tokenizers. It only recognizes comas, parentheses,
// strings and comments.
// regexp generated by scripts/regexps.js then trimmed by hand
var selectorTokenizer = /[(),]|"(?:\\.|[^"\n])*"|'(?:\\.|[^'\n])*'|\/\*[\s\S]*?\*\//g;
/**
* This will split a coma-separated selector list into individual selectors,
* ignoring comas in strings, comments and in :pseudo-selectors(parameter, lists).
*
* @param {string} selector
* @return {string[]}
*/
function splitSelector(selector) {
var indices = [], res = [], inParen = 0, o;
/*eslint-disable no-cond-assign*/
while (o = selectorTokenizer.exec(selector)) {
/*eslint-enable no-cond-assign*/
switch (o[0]) {
case '(': inParen++; break
case ')': inParen--; break
case ',': if (inParen) break; indices.push(o.index);
}
}
for (o = indices.length; o--;){
res.unshift(selector.slice(indices[o] + 1));
selector = selector.slice(0, indices[o]);
}
res.unshift(selector);
return res
}
// Like the `selectorTokenizer`, but for the `&` operator
var ampersandTokenizer = /&|"(?:\\.|[^"\n])*"|'(?:\\.|[^'\n])*'|\/\*[\s\S]*?\*\//g;
function ampersand (selector, parents) {
var indices = [], split = [], res, o;
/*eslint-disable no-cond-assign*/
while (o = ampersandTokenizer.exec(selector)) {
/*eslint-enable no-cond-assign*/
if (o[0] == '&') indices.push(o.index);
}
for (o = indices.length; o--;){
split.unshift(selector.slice(indices[o] + 1));
selector = selector.slice(0, indices[o]);
}
split.unshift(selector);
if (split.length === 1) split.unshift('');
res = [split[0]];
for (o = 1; o < split.length; o++) {
res = cartesian(res, cartesian(parents, [split[o]]));
}
return res.join(',')
}
function flatIter (f) {
return function iter(arg) {
if (type.call(arg) === ARRAY) for (var i= 0 ; i < arg.length; i ++) iter(arg[i]);
else f(arg);
}
}
var chars = '';
function randChars(n) {
while(chars.length < n) chars += Math.floor(Math.random() * 0x100000000).toString(36);
var res = '_' + chars.slice(0, n);
chars = chars.slice(n);
return res
}
function decamelize(match) {
return '-' + match.toLowerCase()
}
/**
* Handles the property:value; pairs.
*
* @param {object} state - holds the localizer- and walker-related methods
* and state
* @param {object} emit - the contextual emitters to the final buffer
* @param {string} prefix - the current property or a prefix in case of nested
* sub-properties.
* @param {array|object|string} o - the declarations.
* @param {boolean} local - are we in @local or in @global scope.
*/
function declarations(state, emit, prefix, o, local) {
var k, v, kk;
if (o==null) return
switch ( type.call(o = o.valueOf()) ) {
case ARRAY:
for (k = 0; k < o.length; k++)
declarations(state, emit, prefix, o[k], local);
break
case OBJECT:
// prefix is falsy iif it is the empty string, which means we're at the root
// of the declarations list.
for (k in o) if (own.call(o, k)){
v = o[k];
if (/\$/.test(k)) {
for (kk in (k = k.split('$'))) if (own.call(k, kk)) {
declarations(state, emit, prefix + k[kk], v, local);
}
} else {
declarations(state, emit, prefix + k, v, local);
}
}
break
default:
// prefix is falsy when it is "", which means that we're
// at the top level.
// `o` is then treated as a `property:value` pair, or a
// semi-colon-separated list thereof.
if (!prefix) return emit.raw(o)
// Otherwise, `prefix` is the property name, and
// `o` is the value.
// restore the dashes
k = prefix.replace(/[A-Z]/g, decamelize);
if (local && (k == 'animation-name' || k == 'animation')) {
// no need to tokenize here a plain `.split(',')` has all bases covered.
// We may 'localize' a comment, but it's not a big deal.
o = o.split(',').map(function (o) {
return o.replace(/^\s*(?:(var\([^)]+\))|:?global\(\s*([_A-Za-z][-\w]*)\s*\)|()(-?[_A-Za-z][-\w]*))/, state.localizeReplacer)
}).join(',');
}
emit.decl(k, o);
}
}
/**
* Handles a single at-rules
*
* @param {object} state - holds the localizer- and walker-related methods
* and state
* @param {object} emit - the contextual emitters to the final buffer
* @param {array} k - The parsed at-rule, including the parameters,
* if takes both parameters and a block.
* k == [match, fullAtRule, atRuleType, params?]
* So in `@-webkit-keyframes foo`, we have
* - match = "@-webkit-keyframes foo"
* - fullAtRule = "@-webkit-keyframes"
* - atRuleType = "keyframes"
* - params = "foo"
* @param {string|string[]|object|object[]} v - Either parameters for
* block-less rules or
* their block
* for the others.
* @param {string} prefix - the current selector or the selector prefix
* in case of nested rules
* @param {boolean} local - are we in @local or in @global scope?
* @param {string} nestingDepth - are we nested in an at-rule or a selector?
*/
function atRules(state, emit, k, v, prefix, local, nestingDepth) {
// First iterate over user-provided at-rules and return if one of them corresponds to the current one
for (var i = 0; i < state.atruleHandlers.length; i++) {
if (state.atruleHandlers[i](state, emit, k, v, prefix, local, nestingDepth)) return
}
// using `/^global$/.test(k[2])` rather that 'global' == k[2] gzips
// slightly better thanks to the regexps tests further down.
// It is slightly less efficient but this isn't a critical path.
if (!k[3] && /^global$/.test(k[2])) {
rules(state, emit, prefix, v, 0, nestingDepth);
} else if (!k[3] && /^local$/.test(k[2])) {
rules(state, emit, prefix, v, 1, nestingDepth);
} else if (k[3] && /^adopt$/.test(k[2])) {
if (!local || nestingDepth) return emit.err('@adopt global or nested: ' + k[0])
if (!/^\.?[_A-Za-z][-\w]*$/.test(k[3])) return emit.err('bad adopter ' + JSON.stringify(k[3]) + ' in ' + k[0])
i = [];
flatIter(function(adoptee, asString) {
if(adoptee == null || !/^\.?[_A-Za-z][-\w]*(?:\s+\.?[_A-Za-z][-\w]*)*$/.test(asString = adoptee + '')) emit.err('bad adoptee '+ JSON.stringify(adoptee) + ' in ' + k[0]);
else i.push(asString.replace(/\./g, ''));
})(v);
// we may end up with duplicate classes but AFAIK it has no consequences on specificity.
if (i.length) {
state.localize(k[3] = k[3].replace(/\./g, ''));
state.names[k[3]] += (' ' + i.join(' '));
}
} else if (!k[3] && /^(?:namespace|import|charset)$/.test(k[2])) {
flatIter(function(v) {
emit.atrule(k[1], k[2], v);
})(v);
} else if (!k[3] && /^(?:font-face|viewport)$/.test(k[2])) {
flatIter(function(v) {
emit.atrule(k[1], k[2], k[3], 'decl');
declarations(state, emit, '', v, local);
emit._atrule();
})(v);
} else if (k[3] && /^(?:media|supports|page|keyframes)$/.test(k[2])) {
if (local && 'keyframes' == k[2]) {
k[3] = k[3].replace(
// generated by script/regexps.js
/(var\([^)]+\))|:?global\(\s*([_A-Za-z][-\w]*)\s*\)|()(-?[_A-Za-z][-\w]*)/,
state.localizeReplacer
);
}
if ('page' == k[2]) {
emit.atrule(k[1], k[2], k[3], 'decl');
declarations(state, emit, '', v, local);
} else {
emit.atrule(k[1], k[2], k[3], 'rule');
rules(
state, emit,
'keyframes' == k[2] ? '' : prefix,
v, local, nestingDepth + 1
);
}
emit._atrule();
} else {
emit.err('Unsupported at-rule: ' + k[0]);
}
}
/**
* Add rulesets and other CSS tree to the sheet.
*
* @param {object} state - holds the localizer- and walker-related methods
* and state
* @param {object} emit - the contextual emitters to the final buffer
* @param {string} prefix - the current selector or a prefix in case of nested rules
* @param {array|string|object} tree - a source object or sub-object.
* @param {string} nestingDepth - are we nested in an at-rule?
* @param {boolean} local - are we in @local or in @global scope?
*/
function rules(state, emit, prefix, tree, local, nestingDepth) {
var k, v, inDeclaration, kk;
switch (type.call(tree)) {
case OBJECT:
for (k in tree) if (own.call(tree, k)) {
v = tree[k];
if (prefix.length > 0 && /^\*?[-\w$]+$/.test(k)) {
if (!inDeclaration) {
inDeclaration = 1;
emit.rule(prefix);
}
if (/\$/.test(k)) {
for (kk in (k = k.split('$'))) if (own.call(k, kk)) {
declarations(state, emit, k[kk], v, local);
}
} else {
declarations(state, emit, k, v, local);
}
} else if (/^@/.test(k)) {
// Handle At-rules
inDeclaration = 0;
atRules(state, emit,
/^(.(?:-[\w]+-)?([_A-Za-z][-\w]*))\b\s*([\s\S]*?)\s*$/.exec(k) || [k,'@','',''],
v, prefix, local, nestingDepth
);
} else {
// selector or nested sub-selectors
inDeclaration = 0;
if (k === '') {
emit._rule();
emit.err("Invalid selector ''");
continue
}
rules(
state, emit,
// build the selector `prefix` for the next iteration.
// ugly and full of redundant bits but so far the fastest/shortest.gz
/*0 if*/(prefix.length > 0 && (/,/.test(prefix) || /,/.test(k))) ?
/*0 then*/ (kk = splitSelector(prefix), splitSelector(
local ?
k.replace(
/("(?:\\.|[^"\n])*"|'(?:\\.|[^'\n])*'|\/\*[\s\S]*?\*\/)|:global\(\s*(\.-?[_A-Za-z][-\w]*)\s*\)|(\.)(-?[_A-Za-z][-\w]*)/g,
state.localizeReplacer
) :
k
).map(function (k) {
return /&/.test(k) ? ampersand(k, kk) : kk.map(function(kk) {
return kk + k
}).join(',')
}).join(',')) :
/*0 else*/ /*1 if*/ /&/.test(k) ?
/*1 then*/ ampersand(
local ?
k.replace(
/("(?:\\.|[^"\n])*"|'(?:\\.|[^'\n])*'|\/\*[\s\S]*?\*\/)|:global\(\s*(\.-?[_A-Za-z][-\w]*)\s*\)|(\.)(-?[_A-Za-z][-\w]*)/g,
state.localizeReplacer
) :
k,
[prefix]
) :
/*1 else*/ prefix + (
local ?
k.replace(
/("(?:\\.|[^"\n])*"|'(?:\\.|[^'\n])*'|\/\*[\s\S]*?\*\/)|:global\(\s*(\.-?[_A-Za-z][-\w]*)\s*\)|(\.)(-?[_A-Za-z][-\w]*)/g,
state.localizeReplacer
) :
k
),
v, local, nestingDepth + 1
);
}
}
break
case ARRAY:
for (k = 0; k < tree.length; k++){
rules(state, emit, prefix, tree[k], local, nestingDepth);
}
break
case STRING:
// CSS hacks or ouptut of `j2c.inline`. Even raw rulesets if in top position.
if (prefix.length) emit.rule(prefix);
emit.raw(tree);
}
}
// This is the first entry in the filters array, which is
// actually the last step of the compiler. It inserts
// closing braces to close normal (non at-) rules (those
// that start with a selector). Doing it earlier is
// impossible without passing state around in unrelated code
// or ending up with duplicated selectors when the source tree
// contains arrays.
// There's no `_rule` handler, because the core compiler never
// calls it.
function closeSelectors(next, inline) {
var lastSelector;
return inline ? next : {
init: function(){lastSelector = ''; next.init();},
done: function () {
if (lastSelector) {next._rule(); lastSelector = '';}
return next.done()
},
atrule: function (rule, kind, param, takesBlock) {
if (lastSelector) {next._rule(); lastSelector = '';}
next.atrule(rule, kind, param, takesBlock);
},
_atrule: function (rule) {
if (lastSelector) {next._rule(); lastSelector = '';}
next._atrule(rule);
},
rule: function (selector) {
if (selector !== lastSelector){
if (lastSelector) next._rule();
next.rule(selector);
lastSelector = selector;
}
},
_rule: function(){
if (lastSelector) {next._rule(); lastSelector = '';}
}
}
}
function invoke(fn, tree, state, backend) {
backend.init();
try{
fn(
state,
backend,
'', // prefix
tree,
1, // local, by default
0 // nesting depth, only for sheet
);
} catch(e) {backend.err(e instanceof Error ? e.stack : '' + e);}
return backend.done()
}
function makeInstance(prefix, suffix, atruleHandlers, nsCache, backend, setPropList) {
var names = {};
function localize(name) {
if (!own.call(names, name)) names[name] = prefix + name + suffix;
return names[name].match(/^\S+/)
}
var state = {
atruleHandlers: atruleHandlers,
names: names,
/**
* Returns a localized version of a given name.
* Registers the pair in `instnace.name` if needed.
*
* @param {string} name - the name to localize
* @return {string} - the localized version
*/
localize: localize,
/**
* Used as second argument for str.replace(localizeRegex, replacer)
* `ignore`, `global` and `(dot, name)` are mutually exclusive
*
* @param {string} match - the whole match (ignored)
* @param {string|null} ignore - a comment or a string literal
* @param {string|null} global - a global name
* @param {string|null} dot - either '.' for a local class name or the empty string otherwise
* @param {string|null} name - the name to localize
* @return {string}
*/
localizeReplacer: function (match, ignore, global, dot, name) {
return ignore || global || dot + localize(name)
}
};
var instance = {
ns: function(name) {
var prefix = '__'+name.replace(/\W+/g, '_') + '_';
if (!own.call(nsCache, prefix)) {
nsCache[prefix] = makeInstance(prefix, suffix, atruleHandlers, nsCache, backend, setPropList);
}
return nsCache[prefix]
},
names: names,
prefix: prefix,
suffix: suffix,
sheet: function(tree) {return invoke(rules, tree, state, backend[0])},
inline: function (tree) {return invoke(declarations, tree, state, backend[1])}
};
for (var i = setPropList.length; i--;) defaults(instance, setPropList[i]);
return instance
}
function J2c(options) {
options = options || {};
// the buffer that accumulates the output. Initialized in `$sink.init()`
var buf, err;
// the default sink.
var _backend = [{
init: function () {buf=[], err=[];},
done: function (raw) {
if (err.length != 0) throw new Error('j2c error(s): ' + JSON.stringify(err,null,2) + ' in context:\n' + buf.join(''))
return raw ? buf : buf.join('')
},
err: function (msg) {
err.push(msg);
buf.push('/* +++ ERROR +++ ' + msg + ' */\n');
},
raw: function (str) {buf.push(str, '\n');},
atrule: function (rule, kind, param, takesBlock) {
buf.push(rule, param && ' ', param, takesBlock ? ' {\n' : ';\n');
},
// close atrule
_atrule: function () {buf.push('}\n');},
rule: function (selector) {buf.push(selector, ' {\n');},
// close rule
_rule: function () {buf.push('}\n');},
decl: function (prop, value) {buf.push(prop, ':', value, ';\n');}
}];
// holds the `_filter` and `atrule` handlers
var _filters = [closeSelectors];
var _atruleHandlers = [];
var _setPropList = [];
var _suffix = randChars(7);
var _nsCache = {};
// the public API (see the main docs)
// handler options
if (type.call(options.plugins) === ARRAY) {
flatIter(function(plugin) {
if (type.call(plugin) !== OBJECT) throw new Error('bad plugin, object expected, got '+ type.call(plugin))
if (type.call(plugin.filter) === FUNCTION) _filters.push(plugin.filter);
if (type.call(plugin.atrule) === FUNCTION) _atruleHandlers.push(plugin.atrule);
if (type.call(plugin.sink) === FUNCTION) _backend = plugin.sink();
if (type.call(plugin.set) === OBJECT) _setPropList.push(plugin.set);
})(options.plugins);
}
if (type.call(options.suffix) === STRING) _suffix = options.suffix;
if (type.call(options.suffix) === NUMBER) _suffix = randChars(options.suffix);
_backend[1] = _backend[1] || {
init: _backend[0].init,
done: _backend[0].done,
raw: _backend[0].raw,
err: _backend[0].err,
decl: _backend[0].decl
};
// finalize the backend by merging in the filters
for(var i = 0; i < 2; i++){ // 0 for j2c.sheet, 1 for j2c.inline
for (var j = _filters.length; j--;) {
_backend[i] = freeze(
defaults(
_filters[j](_backend[i], !!i),
_backend[i]
)
);
}
}
return freeze(makeInstance('', _suffix, _atruleHandlers, _nsCache, _backend, _setPropList))
}
module.exports = J2c;
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