alpaca
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Alpaca provides the easiest and fastest way to generate interactive forms for the web and mobile devices. It runs simply as HTML5 or more elaborately using Bootstrap, jQuery Mobile or jQuery UI. Alpaca uses Handlebars to process JSON schema and provide
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JavaScript
/*!
* Bootstrap Grunt task for parsing Less docstrings
* http://getbootstrap.com
* Copyright 2014 Twitter, Inc.
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
*/
;
var Remarkable = require('remarkable');
function markdown2html(markdownString) {
var md = new Remarkable();
// 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;