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| 'use strict';
var Lexer = require('./lexer');
var nodes = require('./nodes');
var utils = require('./utils');
var filters = require('./filters');
var path = require('path');
var constantinople = require('constantinople');
var parseJSExpression = require('character-parser').parseMax;
var extname = path.extname;
/**
* Initialize `Parser` with the given input `str` and `filename`.
*
* @param {String} str
* @param {String} filename
* @param {Object} options
* @api public
*/
var Parser = exports = module.exports = function Parser(str, filename, options){
//Strip any UTF-8 BOM off of the start of `str`, if it exists.
this.input = str.replace(/^\uFEFF/, '');
this.lexer = new Lexer(this.input, filename);
this.filename = filename;
this.blocks = {};
this.mixins = {};
this.options = options;
this.contexts = [this];
this.inMixin = false;
this.dependencies = [];
this.inBlock = 0;
};
/**
* Parser prototype.
*/
Parser.prototype = {
/**
* Save original constructor
*/
constructor: Parser,
/**
* Push `parser` onto the context stack,
* or pop and return a `Parser`.
*/
context: function(parser){
if (parser) {
this.contexts.push(parser);
} else {
return this.contexts.pop();
}
},
/**
* Return the next token object.
*
* @return {Object}
* @api private
*/
advance: function(){
return this.lexer.advance();
},
/**
* Single token lookahead.
*
* @return {Object}
* @api private
*/
peek: function() {
return this.lookahead(1);
},
/**
* Return lexer lineno.
*
* @return {Number}
* @api private
*/
line: function() {
return this.lexer.lineno;
},
/**
* `n` token lookahead.
*
* @param {Number} n
* @return {Object}
* @api private
*/
lookahead: function(n){
return this.lexer.lookahead(n);
},
/**
* Parse input returning a string of js for evaluation.
*
* @return {String}
* @api public
*/
parse: function(){
var block = new nodes.Block, parser;
block.line = 0;
block.filename = this.filename;
while ('eos' != this.peek().type) {
if ('newline' == this.peek().type) {
this.advance();
} else {
var next = this.peek();
var expr = this.parseExpr();
expr.filename = expr.filename || this.filename;
expr.line = next.line;
block.push(expr);
}
}
if (parser = this.extending) {
this.context(parser);
var ast = parser.parse();
this.context();
// hoist mixins
for (var name in this.mixins)
ast.unshift(this.mixins[name]);
return ast;
}
if (!this.extending && !this.included && Object.keys(this.blocks).length){
var blocks = [];
utils.walkAST(block, function (node) {
if (node.type === 'Block' && node.name) {
blocks.push(node.name);
}
});
Object.keys(this.blocks).forEach(function (name) {
if (blocks.indexOf(name) === -1 && !this.blocks[name].isSubBlock) {
console.warn('Warning: Unexpected block "'
+ name
+ '" '
+ ' on line '
+ this.blocks[name].line
+ ' of '
+ (this.blocks[name].filename)
+ '. This block is never used. This warning will be an error in v2.0.0');
}
}.bind(this));
}
return block;
},
/**
* Expect the given type, or throw an exception.
*
* @param {String} type
* @api private
*/
expect: function(type){
Eif (this.peek().type === type) {
return this.advance();
} else {
throw new Error('expected "' + type + '", but got "' + this.peek().type + '"');
}
},
/**
* Accept the given `type`.
*
* @param {String} type
* @api private
*/
accept: function(type){
if (this.peek().type === type) {
return this.advance();
}
},
/**
* tag
* | doctype
* | mixin
* | include
* | filter
* | comment
* | text
* | each
* | code
* | yield
* | id
* | class
* | interpolation
*/
parseExpr: function(){
switch (this.peek().type) {
case 'tag':
return this.parseTag();
case 'mixin':
return this.parseMixin();
case 'block':
return this.parseBlock();
case 'mixin-block':
return this.parseMixinBlock();
case 'case':
return this.parseCase();
case 'extends':
return this.parseExtends();
case 'include':
return this.parseInclude();
case 'doctype':
return this.parseDoctype();
case 'filter':
return this.parseFilter();
case 'comment':
return this.parseComment();
case 'text':
return this.parseText();
case 'each':
return this.parseEach();
case 'code':
return this.parseCode();
case 'call':
return this.parseCall();
case 'interpolation':
return this.parseInterpolation();
case 'yield':
this.advance();
var block = new nodes.Block;
block.yield = true;
return block;
case 'id':
case 'class':
var tok = this.advance();
this.lexer.defer(this.lexer.tok('tag', 'div'));
this.lexer.defer(tok);
return this.parseExpr();
default:
throw new Error('unexpected token "' + this.peek().type + '"');
}
},
/**
* Text
*/
parseText: function(){
var tok = this.expect('text');
var tokens = this.parseInlineTagsInText(tok.val);
if (tokens.length === 1) return tokens[0];
var node = new nodes.Block;
for (var i = 0; i < tokens.length; i++) {
node.push(tokens[i]);
};
return node;
},
/**
* ':' expr
* | block
*/
parseBlockExpansion: function(){
if (':' == this.peek().type) {
this.advance();
return new nodes.Block(this.parseExpr());
} else {
return this.block();
}
},
/**
* case
*/
parseCase: function(){
var val = this.expect('case').val;
var node = new nodes.Case(val);
node.line = this.line();
var block = new nodes.Block;
block.line = this.line();
block.filename = this.filename;
this.expect('indent');
while ('outdent' != this.peek().type) {
switch (this.peek().type) {
case 'newline':
this.advance();
break;
case 'when':
block.push(this.parseWhen());
break;
case 'default':
block.push(this.parseDefault());
break;
default:
throw new Error('Unexpected token "' + this.peek().type
+ '", expected "when", "default" or "newline"');
}
}
this.expect('outdent');
node.block = block;
return node;
},
/**
* when
*/
parseWhen: function(){
var val = this.expect('when').val;
if (this.peek().type !== 'newline')
return new nodes.Case.When(val, this.parseBlockExpansion());
else
return new nodes.Case.When(val);
},
/**
* default
*/
parseDefault: function(){
this.expect('default');
return new nodes.Case.When('default', this.parseBlockExpansion());
},
/**
* code
*/
parseCode: function(afterIf){
var tok = this.expect('code');
var node = new nodes.Code(tok.val, tok.buffer, tok.escape);
var block;
node.line = this.line();
// throw an error if an else does not have an if
if (tok.isElse && !tok.hasIf) {
throw new Error('Unexpected else without if');
}
// handle block
block = 'indent' == this.peek().type;
if (block) {
node.block = this.block();
}
// handle missing block
if (tok.requiresBlock && !block) {
node.block = new nodes.Block();
}
// mark presense of if for future elses
if (tok.isIf && this.peek().isElse) {
this.peek().hasIf = true;
} else if (tok.isIf && this.peek().type === 'newline' && this.lookahead(2).isElse) {
this.lookahead(2).hasIf = true;
}
return node;
},
/**
* comment
*/
parseComment: function(){
var tok = this.expect('comment');
var node;
var block;
if (block = this.parseTextBlock()) {
node = new nodes.BlockComment(tok.val, block, tok.buffer);
} else {
node = new nodes.Comment(tok.val, tok.buffer);
}
node.line = this.line();
return node;
},
/**
* doctype
*/
parseDoctype: function(){
var tok = this.expect('doctype');
var node = new nodes.Doctype(tok.val);
node.line = this.line();
return node;
},
/**
* filter attrs? text-block
*/
parseFilter: function(){
var tok = this.expect('filter');
var attrs = this.accept('attrs');
var block;
block = this.parseTextBlock() || new nodes.Block();
var options = {};
if (attrs) {
attrs.attrs.forEach(function (attribute) {
options[attribute.name] = constantinople.toConstant(attribute.val);
});
}
var node = new nodes.Filter(tok.val, block, options);
node.line = this.line();
return node;
},
/**
* each block
*/
parseEach: function(){
var tok = this.expect('each');
var node = new nodes.Each(tok.code, tok.val, tok.key);
node.line = this.line();
node.block = this.block();
if (this.peek().type == 'code' && this.peek().val == 'else') {
this.advance();
node.alternative = this.block();
}
return node;
},
/**
* Resolves a path relative to the template for use in
* includes and extends
*
* @param {String} path
* @param {String} purpose Used in error messages.
* @return {String}
* @api private
*/
resolvePath: function (path, purpose) {
var p = require('path');
var dirname = p.dirname;
var basename = p.basename;
var join = p.join;
if (path[0] !== '/' && !this.filename)
throw new Error('the "filename" option is required to use "' + purpose + '" with "relative" paths');
if (path[0] === '/' && !this.options.basedir)
throw new Error('the "basedir" option is required to use "' + purpose + '" with "absolute" paths');
path = join(path[0] === '/' ? this.options.basedir : dirname(this.filename), path);
if (basename(path).indexOf('.') === -1) path += '.jade';
return path;
},
/**
* 'extends' name
*/
parseExtends: function(){
var fs = require('fs');
var path = this.resolvePath(this.expect('extends').val.trim(), 'extends');
if ('.jade' != path.substr(-5)) path += '.jade';
this.dependencies.push(path);
var str = fs.readFileSync(path, 'utf8');
var parser = new this.constructor(str, path, this.options);
parser.dependencies = this.dependencies;
parser.blocks = this.blocks;
parser.included = this.included;
parser.contexts = this.contexts;
this.extending = parser;
// TODO: null node
return new nodes.Literal('');
},
/**
* 'block' name block
*/
parseBlock: function(){
var block = this.expect('block');
var mode = block.mode;
var name = block.val.trim();
var line = block.line;
this.inBlock++;
block = 'indent' == this.peek().type
? this.block()
: new nodes.Block(new nodes.Literal(''));
this.inBlock--;
block.name = name;
block.line = line;
var prev = this.blocks[name] || {prepended: [], appended: []}
if (prev.mode === 'replace') return this.blocks[name] = prev;
var allNodes = prev.prepended.concat(block.nodes).concat(prev.appended);
switch (mode) {
case 'append':
prev.appended = prev.parser === this ?
prev.appended.concat(block.nodes) :
block.nodes.concat(prev.appended);
break;
case 'prepend':
prev.prepended = prev.parser === this ?
block.nodes.concat(prev.prepended) :
prev.prepended.concat(block.nodes);
break;
}
block.nodes = allNodes;
block.appended = prev.appended;
block.prepended = prev.prepended;
block.mode = mode;
block.parser = this;
block.isSubBlock = this.inBlock > 0;
return this.blocks[name] = block;
},
parseMixinBlock: function () {
var block = this.expect('mixin-block');
if (!this.inMixin) {
throw new Error('Anonymous blocks are not allowed unless they are part of a mixin.');
}
return new nodes.MixinBlock();
},
/**
* include block?
*/
parseInclude: function(){
var fs = require('fs');
var tok = this.expect('include');
var path = this.resolvePath(tok.val.trim(), 'include');
this.dependencies.push(path);
// has-filter
if (tok.filter) {
var str = fs.readFileSync(path, 'utf8').replace(/\r/g, '');
var options = {filename: path};
if (tok.attrs) {
tok.attrs.attrs.forEach(function (attribute) {
options[attribute.name] = constantinople.toConstant(attribute.val);
});
}
str = filters(tok.filter, str, options);
return new nodes.Literal(str);
}
// non-jade
if ('.jade' != path.substr(-5)) {
var str = fs.readFileSync(path, 'utf8').replace(/\r/g, '');
return new nodes.Literal(str);
}
var str = fs.readFileSync(path, 'utf8');
var parser = new this.constructor(str, path, this.options);
parser.dependencies = this.dependencies;
parser.blocks = utils.merge({}, this.blocks);
parser.included = true;
parser.mixins = this.mixins;
this.context(parser);
var ast = parser.parse();
this.context();
ast.filename = path;
if ('indent' == this.peek().type) {
ast.includeBlock().push(this.block());
}
return ast;
},
/**
* call ident block
*/
parseCall: function(){
var tok = this.expect('call');
var name = tok.val;
var args = tok.args;
var mixin = new nodes.Mixin(name, args, new nodes.Block, true);
this.tag(mixin);
if (mixin.code) {
mixin.block.push(mixin.code);
mixin.code = null;
}
if (mixin.block.isEmpty()) mixin.block = null;
return mixin;
},
/**
* mixin block
*/
parseMixin: function(){
var tok = this.expect('mixin');
var name = tok.val;
var args = tok.args;
var mixin;
// definition
if ('indent' == this.peek().type) {
this.inMixin = true;
mixin = new nodes.Mixin(name, args, this.block(), false);
this.mixins[name] = mixin;
this.inMixin = false;
return mixin;
// call
} else {
return new nodes.Mixin(name, args, null, true);
}
},
parseInlineTagsInText: function (str) {
var line = this.line();
var match = /(\\)?#\[((?:.|\n)*)$/.exec(str);
if (match) {
if (match[1]) { // escape
var text = new nodes.Text(str.substr(0, match.index) + '#[');
text.line = line;
var rest = this.parseInlineTagsInText(match[2]);
Eif (rest[0].type === 'Text') {
text.val += rest[0].val;
rest.shift();
}
return [text].concat(rest);
} else {
var text = new nodes.Text(str.substr(0, match.index));
text.line = line;
var buffer = [text];
var rest = match[2];
var range = parseJSExpression(rest);
var inner = new Parser(range.src, this.filename, this.options);
buffer.push(inner.parse());
return buffer.concat(this.parseInlineTagsInText(rest.substr(range.end + 1)));
}
} else {
var text = new nodes.Text(str);
text.line = line;
return [text];
}
},
/**
* indent (text | newline)* outdent
*/
parseTextBlock: function(){
var block = new nodes.Block;
block.line = this.line();
var body = this.peek();
if (body.type !== 'pipeless-text') return;
this.advance();
block.nodes = body.val.reduce(function (accumulator, text) {
return accumulator.concat(this.parseInlineTagsInText(text));
}.bind(this), []);
return block;
},
/**
* indent expr* outdent
*/
block: function(){
var block = new nodes.Block;
block.line = this.line();
block.filename = this.filename;
this.expect('indent');
while ('outdent' != this.peek().type) {
if ('newline' == this.peek().type) {
this.advance();
} else {
var expr = this.parseExpr();
expr.filename = this.filename;
block.push(expr);
}
}
this.expect('outdent');
return block;
},
/**
* interpolation (attrs | class | id)* (text | code | ':')? newline* block?
*/
parseInterpolation: function(){
var tok = this.advance();
var tag = new nodes.Tag(tok.val);
tag.buffer = true;
return this.tag(tag);
},
/**
* tag (attrs | class | id)* (text | code | ':')? newline* block?
*/
parseTag: function(){
var tok = this.advance();
var tag = new nodes.Tag(tok.val);
tag.selfClosing = tok.selfClosing;
return this.tag(tag);
},
/**
* Parse tag.
*/
tag: function(tag){
tag.line = this.line();
var seenAttrs = false;
// (attrs | class | id)*
out:
while (true) {
switch (this.peek().type) {
case 'id':
case 'class':
var tok = this.advance();
tag.setAttribute(tok.type, "'" + tok.val + "'");
continue;
case 'attrs':
if (seenAttrs) {
console.warn(this.filename + ', line ' + this.peek().line + ':\nYou should not have jade tags with multiple attributes.');
}
seenAttrs = true;
var tok = this.advance();
var attrs = tok.attrs;
if (tok.selfClosing) tag.selfClosing = true;
for (var i = 0; i < attrs.length; i++) {
tag.setAttribute(attrs[i].name, attrs[i].val, attrs[i].escaped);
}
continue;
case '&attributes':
var tok = this.advance();
tag.addAttributes(tok.val);
break;
default:
break out;
}
}
// check immediate '.'
if ('dot' == this.peek().type) {
tag.textOnly = true;
this.advance();
}
// (text | code | ':')?
switch (this.peek().type) {
case 'text':
tag.block.push(this.parseText());
break;
case 'code':
tag.code = this.parseCode();
break;
case ':':
this.advance();
tag.block = new nodes.Block;
tag.block.push(this.parseExpr());
break;
case 'newline':
case 'indent':
case 'outdent':
case 'eos':
case 'pipeless-text':
break;
default:
throw new Error('Unexpected token `' + this.peek().type + '` expected `text`, `code`, `:`, `newline` or `eos`')
}
// newline*
while ('newline' == this.peek().type) this.advance();
// block?
if (tag.textOnly) {
tag.block = this.parseTextBlock() || new nodes.Block();
} else if ('indent' == this.peek().type) {
var block = this.block();
for (var i = 0, len = block.nodes.length; i < len; ++i) {
tag.block.push(block.nodes[i]);
}
}
return tag;
}
};
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