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/*!
* Bootstrap Grunt task for parsing Less docstrings
* http://getbootstrap.com
* Copyright 2014-2015 Twitter, Inc.
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
*/
'use strict';
var Markdown = require('markdown-it');
function markdown2html(markdownString) {
var md = new Markdown();
// the slice removes the <p>...</p> wrapper output by Markdown processor
return md.render(markdownString.trim()).slice(3, -5);
}
/*
Mini-language:
//== This is a normal heading, which starts a section. Sections group variables together.
//## Optional description for the heading
//=== This is a subheading.
//** Optional description for the following variable. You **can** use Markdown in descriptions to discuss `<html>` stuff.
@foo: #fff;
//-- This is a heading for a section whose variables shouldn't be customizable
All other lines are ignored completely.
*/
var CUSTOMIZABLE_HEADING = /^[/]{2}={2}(.*)$/;
var UNCUSTOMIZABLE_HEADING = /^[/]{2}-{2}(.*)$/;
var SUBSECTION_HEADING = /^[/]{2}={3}(.*)$/;
var SECTION_DOCSTRING = /^[/]{2}#{2}(.+)$/;
var VAR_ASSIGNMENT = /^(@[a-zA-Z0-9_-]+):[ ]*([^ ;][^;]*);[ ]*$/;
var VAR_DOCSTRING = /^[/]{2}[*]{2}(.+)$/;
function Section(heading, customizable) {
this.heading = heading.trim();
this.id = this.heading.replace(/\s+/g, '-').toLowerCase();
this.customizable = customizable;
this.docstring = null;
this.subsections = [];
}
Section.prototype.addSubSection = function (subsection) {
this.subsections.push(subsection);
};
function SubSection(heading) {
this.heading = heading.trim();
this.id = this.heading.replace(/\s+/g, '-').toLowerCase();
this.variables = [];
}
SubSection.prototype.addVar = function (variable) {
this.variables.push(variable);
};
function VarDocstring(markdownString) {
this.html = markdown2html(markdownString);
}
function SectionDocstring(markdownString) {
this.html = markdown2html(markdownString);
}
function Variable(name, defaultValue) {
this.name = name;
this.defaultValue = defaultValue;
this.docstring = null;
}
function Tokenizer(fileContent) {
this._lines = fileContent.split('\n');
this._next = undefined;
}
Tokenizer.prototype.unshift = function (token) {
if (this._next !== undefined) {
throw new Error('Attempted to unshift twice!');
}
this._next = token;
};
Tokenizer.prototype._shift = function () {
// returning null signals EOF
// returning undefined means the line was ignored
if (this._next !== undefined) {
var result = this._next;
this._next = undefined;
return result;
}
if (this._lines.length <= 0) {
return null;
}
var line = this._lines.shift();
var match = null;
match = SUBSECTION_HEADING.exec(line);
if (match !== null) {
return new SubSection(match[1]);
}
match = CUSTOMIZABLE_HEADING.exec(line);
if (match !== null) {
return new Section(match[1], true);
}
match = UNCUSTOMIZABLE_HEADING.exec(line);
if (match !== null) {
return new Section(match[1], false);
}
match = SECTION_DOCSTRING.exec(line);
if (match !== null) {
return new SectionDocstring(match[1]);
}
match = VAR_DOCSTRING.exec(line);
if (match !== null) {
return new VarDocstring(match[1]);
}
var commentStart = line.lastIndexOf('//');
var varLine = commentStart === -1 ? line : line.slice(0, commentStart);
match = VAR_ASSIGNMENT.exec(varLine);
if (match !== null) {
return new Variable(match[1], match[2]);
}
return undefined;
};
Tokenizer.prototype.shift = function () {
while (true) {
var result = this._shift();
if (result === undefined) {
continue;
}
return result;
}
};
function Parser(fileContent) {
this._tokenizer = new Tokenizer(fileContent);
}
Parser.prototype.parseFile = function () {
var sections = [];
while (true) {
var section = this.parseSection();
if (section === null) {
if (this._tokenizer.shift() !== null) {
throw new Error('Unexpected unparsed section of file remains!');
}
return sections;
}
sections.push(section);
}
};
Parser.prototype.parseSection = function () {
var section = this._tokenizer.shift();
if (section === null) {
return null;
}
if (!(section instanceof Section)) {
throw new Error('Expected section heading; got: ' + JSON.stringify(section));
}
var docstring = this._tokenizer.shift();
if (docstring instanceof SectionDocstring) {
section.docstring = docstring;
} else {
this._tokenizer.unshift(docstring);
}
this.parseSubSections(section);
return section;
};
Parser.prototype.parseSubSections = function (section) {
while (true) {
var subsection = this.parseSubSection();
if (subsection === null) {
if (section.subsections.length === 0) {
// Presume an implicit initial subsection
subsection = new SubSection('');
this.parseVars(subsection);
} else {
break;
}
}
section.addSubSection(subsection);
}
if (section.subsections.length === 1 && !section.subsections[0].heading && section.subsections[0].variables.length === 0) {
// Ignore lone empty implicit subsection
section.subsections = [];
}
};
Parser.prototype.parseSubSection = function () {
var subsection = this._tokenizer.shift();
if (subsection instanceof SubSection) {
this.parseVars(subsection);
return subsection;
}
this._tokenizer.unshift(subsection);
return null;
};
Parser.prototype.parseVars = function (subsection) {
while (true) {
var variable = this.parseVar();
if (variable === null) {
return;
}
subsection.addVar(variable);
}
};
Parser.prototype.parseVar = function () {
var docstring = this._tokenizer.shift();
if (!(docstring instanceof VarDocstring)) {
this._tokenizer.unshift(docstring);
docstring = null;
}
var variable = this._tokenizer.shift();
if (variable instanceof Variable) {
variable.docstring = docstring;
return variable;
}
this._tokenizer.unshift(variable);
return null;
};
module.exports = Parser;