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https://github.com/Jermolene/TiddlyWiki5
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269 lines
7.0 KiB
JavaScript
269 lines
7.0 KiB
JavaScript
/*\
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title: $:/core/modules/utils/parseutils.js
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type: application/javascript
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module-type: utils
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Utility functions concerned with parsing text into tokens.
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Most functions have the following pattern:
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* The parameters are:
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** `source`: the source string being parsed
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** `pos`: the current parse position within the string
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** Any further parameters are used to identify the token that is being parsed
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* The return value is:
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** null if the token was not found at the specified position
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** an object representing the token with the following standard fields:
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*** `type`: string indicating the type of the token
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*** `start`: start position of the token in the source string
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*** `end`: end position of the token in the source string
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*** Any further fields required to describe the token
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The exception is `skipWhiteSpace`, which just returns the position after the whitespace.
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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/*
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Look for a whitespace token. Returns null if not found, otherwise returns {type: "whitespace", start:, end:,}
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*/
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exports.parseWhiteSpace = function(source,pos) {
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var node = {
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type: "whitespace",
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start: pos
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};
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var re = /(\s)+/g;
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re.lastIndex = pos;
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var match = re.exec(source);
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if(match && match.index === pos) {
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node.end = pos + match[0].length;
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return node;
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}
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return null;
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};
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/*
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Convenience wrapper for parseWhiteSpace. Returns the position after the whitespace
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*/
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exports.skipWhiteSpace = function(source,pos) {
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var whitespace = $tw.utils.parseWhiteSpace(source,pos);
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if(whitespace) {
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return whitespace.end;
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}
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return pos;
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};
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/*
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Look for a given string token. Returns null if not found, otherwise returns {type: "token", value:, start:, end:,}
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*/
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exports.parseTokenString = function(source,pos,token) {
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var match = source.indexOf(token,pos) === pos;
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if(match) {
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return {
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type: "token",
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value: token,
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start: pos,
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end: pos + token.length
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};
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}
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return null;
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};
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/*
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Look for a token matching a regex. Returns null if not found, otherwise returns {type: "regexp", match:, start:, end:,}
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*/
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exports.parseTokenRegExp = function(source,pos,reToken) {
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var node = {
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type: "regexp",
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start: pos
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};
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reToken.lastIndex = pos;
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node.match = reToken.exec(source);
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if(node.match && node.match.index === pos) {
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node.end = pos + node.match[0].length;
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return node;
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} else {
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return null;
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}
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};
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/*
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Look for a string literal. Returns null if not found, otherwise returns {type: "string", value:, start:, end:,}
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*/
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exports.parseStringLiteral = function(source,pos) {
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var node = {
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type: "string",
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start: pos
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};
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var reString = /(?:"([^"]*)")|(?:'([^']*)')/g;
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reString.lastIndex = pos;
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var match = reString.exec(source);
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if(match && match.index === pos) {
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node.value = match[1] === undefined ? match[2] : match[1];
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node.end = pos + match[0].length;
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return node;
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} else {
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return null;
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}
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};
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/*
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Look for a macro invocation parameter. Returns null if not found, or {type: "macro-parameter", name:, value:, start:, end:}
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*/
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exports.parseMacroParameter = function(source,pos) {
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var node = {
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type: "macro-parameter",
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start: pos
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};
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// Define our regexp
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var reMacroParameter = /(?:([A-Za-z0-9\-_]+)\s*:)?(?:\s*(?:"([^"]*)"|'([^']*)'|\[\[([^\]]*)\]\]|([^\s>"'=]+)))/g;
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// Skip whitespace
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pos = $tw.utils.skipWhiteSpace(source,pos);
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// Look for the parameter
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var token = $tw.utils.parseTokenRegExp(source,pos,reMacroParameter);
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if(!token) {
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return null;
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}
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pos = token.end;
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// Get the parameter details
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node.value = token.match[2] !== undefined ? token.match[2] : (
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token.match[3] !== undefined ? token.match[3] : (
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token.match[4] !== undefined ? token.match[4] : (
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token.match[5] !== undefined ? token.match[5] : (
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""
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)
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)
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)
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);
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if(token.match[1]) {
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node.name = token.match[1];
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}
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// Update the end position
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node.end = pos;
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return node;
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};
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/*
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Look for a macro invocation. Returns null if not found, or {type: "macrocall", name:, parameters:, start:, end:}
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*/
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exports.parseMacroInvocation = function(source,pos) {
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var node = {
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type: "macrocall",
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start: pos,
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params: []
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};
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// Define our regexps
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var reMacroName = /([^\s>"'=]+)/g;
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// Skip whitespace
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pos = $tw.utils.skipWhiteSpace(source,pos);
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// Look for a double less than sign
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var token = $tw.utils.parseTokenString(source,pos,"<<");
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if(!token) {
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return null;
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}
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pos = token.end;
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// Get the macro name
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var name = $tw.utils.parseTokenRegExp(source,pos,reMacroName);
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if(!name) {
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return null;
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}
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node.name = name.match[1];
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pos = name.end;
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// Process parameters
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var parameter = $tw.utils.parseMacroParameter(source,pos);
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while(parameter) {
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node.params.push(parameter);
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pos = parameter.end;
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// Get the next parameter
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parameter = $tw.utils.parseMacroParameter(source,pos);
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}
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// Skip whitespace
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pos = $tw.utils.skipWhiteSpace(source,pos);
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// Look for a double greater than sign
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token = $tw.utils.parseTokenString(source,pos,">>");
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if(!token) {
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return null;
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}
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pos = token.end;
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// Update the end position
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node.end = pos;
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return node;
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};
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/*
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Look for an HTML attribute definition. Returns null if not found, otherwise returns {type: "attribute", name:, valueType: "string|indirect|macro", value:, start:, end:,}
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*/
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exports.parseAttribute = function(source,pos) {
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var node = {
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start: pos
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};
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// Define our regexps
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var reAttributeName = /([^\/\s>"'=]+)/g,
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reUnquotedAttribute = /([^\/\s<>"'=]+)/g,
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reIndirectValue = /\{\{([^\}]+)\}\}/g;
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// Skip whitespace
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pos = $tw.utils.skipWhiteSpace(source,pos);
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// Get the attribute name
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var name = $tw.utils.parseTokenRegExp(source,pos,reAttributeName);
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if(!name) {
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return null;
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}
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node.name = name.match[1];
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pos = name.end;
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// Skip whitespace
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pos = $tw.utils.skipWhiteSpace(source,pos);
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// Look for an equals sign
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var token = $tw.utils.parseTokenString(source,pos,"=");
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if(token) {
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pos = token.end;
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// Skip whitespace
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pos = $tw.utils.skipWhiteSpace(source,pos);
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// Look for a string literal
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var stringLiteral = $tw.utils.parseStringLiteral(source,pos);
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if(stringLiteral) {
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pos = stringLiteral.end;
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node.type = "string";
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node.value = stringLiteral.value;
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} else {
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// Look for an indirect value
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var indirectValue = $tw.utils.parseTokenRegExp(source,pos,reIndirectValue);
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if(indirectValue) {
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pos = indirectValue.end;
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node.type = "indirect";
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node.textReference = indirectValue.match[1];
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} else {
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// Look for a unquoted value
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var unquotedValue = $tw.utils.parseTokenRegExp(source,pos,reUnquotedAttribute);
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if(unquotedValue) {
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pos = unquotedValue.end;
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node.type = "string";
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node.value = unquotedValue.match[1];
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} else {
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// Look for a macro invocation value
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var macroInvocation = $tw.utils.parseMacroInvocation(source,pos);
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if(macroInvocation) {
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pos = macroInvocation.end;
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node.type = "macro";
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node.value = macroInvocation;
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} else {
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node.type = "string";
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node.value = "true";
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}
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}
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}
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}
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} else {
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node.type = "string";
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node.value = "true";
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}
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// Update the end position
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node.end = pos;
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return node;
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};
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})();
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