107 lines
3.3 KiB
JavaScript
107 lines
3.3 KiB
JavaScript
/*\
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title: js/JavaScriptParser.js
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Parses JavaScript source code into a parse tree using Esprima
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\*/
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(function(){
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/*jslint node: true */
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"use strict";
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var Renderer = require("./Renderer.js").Renderer,
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Dependencies = require("./Dependencies.js").Dependencies,
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esprima = require("esprima");
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// Initialise the parser
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var JavaScriptParser = function(options) {
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this.store = options.store;
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};
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// Parse a string of JavaScript code and return the parse tree as a wikitext parse tree
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JavaScriptParser.prototype.parse = function(type,code) {
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// Simplisticly replace tabs with spaces. Browsers will happily render tabs but most default to 8 character tab stops
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code = code.replace(/\t/mg," ");
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// Try to parse the code
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var parseTree;
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try {
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parseTree = esprima.parse(code,{comment: true,tokens: true,range: true});
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} catch(ex) {
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// Return a helpful error if the parse failed
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return new Renderer([
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Renderer.ElementNode("pre",{"class": "javascript-source"},[
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Renderer.TextNode(code.substring(0,ex.index)),
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Renderer.ErrorNode(ex),
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Renderer.TextNode(code.substring(ex.index))
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])
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],new Dependencies(),this.store);
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}
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// Helpers to render the comments and tokens with the appropriate classes
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var self = this,
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result = [],
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nextComment = 0,
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nextToken = 0,
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currPos = 0;
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var renderWhitespace = function(nextPos) {
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if(currPos < nextPos) {
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result.push(Renderer.TextNode(code.substring(currPos,nextPos)));
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}
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},
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renderComment = function(comment) {
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var text = comment.value,
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element,
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classes = ["javascript-comment"],
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content = [];
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renderWhitespace(comment.range[0]);
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if(comment.type === "Block") {
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element = "div";
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classes.push("javascript-block-comment");
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content.push(Renderer.TextNode("/*"));
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} else {
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element = "span";
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classes.push("javascript-line-comment");
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content.push(Renderer.TextNode("//"));
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}
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content.push.apply(content,self.store.parseText("text/x-tiddlywiki",text).nodes);
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if(comment.type === "Block") {
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content.push(Renderer.TextNode("*/"));
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} else {
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content.push(Renderer.TextNode("\n"));
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}
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result.push(Renderer.ElementNode(element,{"class": classes},content));
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currPos = comment.range[1] + 1;
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},
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renderToken = function(token) {
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renderWhitespace(token.range[0]);
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result.push(Renderer.ElementNode("span",{
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"class": "javascript-" + token.type.toLowerCase()
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},[
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Renderer.TextNode(token.value)
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]));
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currPos = token.range[1] + 1;
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};
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// Process the tokens interleaved with the comments
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while(nextComment < parseTree.comments.length || nextToken < parseTree.tokens.length) {
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if(nextComment < parseTree.comments.length && nextToken < parseTree.tokens.length) {
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if(parseTree.comments[nextComment].range[0] < parseTree.tokens[nextToken].range[0]) {
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renderComment(parseTree.comments[nextComment++]);
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} else {
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renderToken(parseTree.tokens[nextToken++]);
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}
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} else if(nextComment < parseTree.comments.length) {
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renderComment(parseTree.comments[nextComment++]);
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} else {
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renderToken(parseTree.tokens[nextToken++]);
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}
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}
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renderWhitespace(code.length);
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// Wrap the whole lot in a `<PRE>`
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return new Renderer([
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Renderer.ElementNode("pre",{"class": "javascript-source"},result)
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],new Dependencies(),this.store);
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};
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exports.JavaScriptParser = JavaScriptParser;
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})();
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