292 lines
7.7 KiB
JavaScript
292 lines
7.7 KiB
JavaScript
/*\
|
|
title: $:/core/modules/utils/parseutils.js
|
|
type: application/javascript
|
|
module-type: utils
|
|
|
|
Utility functions concerned with parsing text into tokens.
|
|
|
|
Most functions have the following pattern:
|
|
|
|
* The parameters are:
|
|
** `source`: the source string being parsed
|
|
** `pos`: the current parse position within the string
|
|
** Any further parameters are used to identify the token that is being parsed
|
|
* The return value is:
|
|
** null if the token was not found at the specified position
|
|
** an object representing the token with the following standard fields:
|
|
*** `type`: string indicating the type of the token
|
|
*** `start`: start position of the token in the source string
|
|
*** `end`: end position of the token in the source string
|
|
*** Any further fields required to describe the token
|
|
|
|
The exception is `skipWhiteSpace`, which just returns the position after the whitespace.
|
|
|
|
\*/
|
|
(function(){
|
|
|
|
/*jslint node: true, browser: true */
|
|
/*global $tw: false */
|
|
"use strict";
|
|
|
|
/*
|
|
Look for a whitespace token. Returns null if not found, otherwise returns {type: "whitespace", start:, end:,}
|
|
*/
|
|
exports.parseWhiteSpace = function(source,pos) {
|
|
var p = pos,c;
|
|
while(true) {
|
|
c = source.charAt(p);
|
|
if((c === " ") || (c === "\f") || (c === "\n") || (c === "\r") || (c === "\t") || (c === "\v") || (c === "\u00a0")) { // Ignores some obscure unicode spaces
|
|
p++;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
if(p === pos) {
|
|
return null;
|
|
} else {
|
|
return {
|
|
type: "whitespace",
|
|
start: pos,
|
|
end: p
|
|
}
|
|
}
|
|
};
|
|
|
|
/*
|
|
Convenience wrapper for parseWhiteSpace. Returns the position after the whitespace
|
|
*/
|
|
exports.skipWhiteSpace = function(source,pos) {
|
|
var c;
|
|
while(true) {
|
|
c = source.charAt(pos);
|
|
if((c === " ") || (c === "\f") || (c === "\n") || (c === "\r") || (c === "\t") || (c === "\v") || (c === "\u00a0")) { // Ignores some obscure unicode spaces
|
|
pos++;
|
|
} else {
|
|
return pos;
|
|
}
|
|
}
|
|
};
|
|
|
|
/*
|
|
Look for a given string token. Returns null if not found, otherwise returns {type: "token", value:, start:, end:,}
|
|
*/
|
|
exports.parseTokenString = function(source,pos,token) {
|
|
var match = source.indexOf(token,pos) === pos;
|
|
if(match) {
|
|
return {
|
|
type: "token",
|
|
value: token,
|
|
start: pos,
|
|
end: pos + token.length
|
|
};
|
|
}
|
|
return null;
|
|
};
|
|
|
|
/*
|
|
Look for a token matching a regex. Returns null if not found, otherwise returns {type: "regexp", match:, start:, end:,}
|
|
*/
|
|
exports.parseTokenRegExp = function(source,pos,reToken) {
|
|
var node = {
|
|
type: "regexp",
|
|
start: pos
|
|
};
|
|
reToken.lastIndex = pos;
|
|
node.match = reToken.exec(source);
|
|
if(node.match && node.match.index === pos) {
|
|
node.end = pos + node.match[0].length;
|
|
return node;
|
|
} else {
|
|
return null;
|
|
}
|
|
};
|
|
|
|
/*
|
|
Look for a string literal. Returns null if not found, otherwise returns {type: "string", value:, start:, end:,}
|
|
*/
|
|
exports.parseStringLiteral = function(source,pos) {
|
|
var node = {
|
|
type: "string",
|
|
start: pos
|
|
};
|
|
var reString = /(?:"""([\s\S]*?)"""|"([^"]*)")|(?:'([^']*)')/g;
|
|
reString.lastIndex = pos;
|
|
var match = reString.exec(source);
|
|
if(match && match.index === pos) {
|
|
node.value = match[1] !== undefined ? match[1] :(
|
|
match[2] !== undefined ? match[2] : match[3]
|
|
);
|
|
node.end = pos + match[0].length;
|
|
return node;
|
|
} else {
|
|
return null;
|
|
}
|
|
};
|
|
|
|
/*
|
|
Look for a macro invocation parameter. Returns null if not found, or {type: "macro-parameter", name:, value:, start:, end:}
|
|
*/
|
|
exports.parseMacroParameter = function(source,pos) {
|
|
var node = {
|
|
type: "macro-parameter",
|
|
start: pos
|
|
};
|
|
// Define our regexp
|
|
var reMacroParameter = /(?:([A-Za-z0-9\-_]+)\s*:)?(?:\s*(?:"""([\s\S]*?)"""|"([^"]*)"|'([^']*)'|\[\[([^\]]*)\]\]|([^\s>"'=]+)))/g;
|
|
// Skip whitespace
|
|
pos = $tw.utils.skipWhiteSpace(source,pos);
|
|
// Look for the parameter
|
|
var token = $tw.utils.parseTokenRegExp(source,pos,reMacroParameter);
|
|
if(!token) {
|
|
return null;
|
|
}
|
|
pos = token.end;
|
|
// Get the parameter details
|
|
node.value = token.match[2] !== undefined ? token.match[2] : (
|
|
token.match[3] !== undefined ? token.match[3] : (
|
|
token.match[4] !== undefined ? token.match[4] : (
|
|
token.match[5] !== undefined ? token.match[5] : (
|
|
token.match[6] !== undefined ? token.match[6] : (
|
|
""
|
|
)
|
|
)
|
|
)
|
|
)
|
|
);
|
|
if(token.match[1]) {
|
|
node.name = token.match[1];
|
|
}
|
|
// Update the end position
|
|
node.end = pos;
|
|
return node;
|
|
};
|
|
|
|
/*
|
|
Look for a macro invocation. Returns null if not found, or {type: "macrocall", name:, parameters:, start:, end:}
|
|
*/
|
|
exports.parseMacroInvocation = function(source,pos) {
|
|
var node = {
|
|
type: "macrocall",
|
|
start: pos,
|
|
params: []
|
|
};
|
|
// Define our regexps
|
|
var reMacroName = /([^\s>"'=]+)/g;
|
|
// Skip whitespace
|
|
pos = $tw.utils.skipWhiteSpace(source,pos);
|
|
// Look for a double less than sign
|
|
var token = $tw.utils.parseTokenString(source,pos,"<<");
|
|
if(!token) {
|
|
return null;
|
|
}
|
|
pos = token.end;
|
|
// Get the macro name
|
|
var name = $tw.utils.parseTokenRegExp(source,pos,reMacroName);
|
|
if(!name) {
|
|
return null;
|
|
}
|
|
node.name = name.match[1];
|
|
pos = name.end;
|
|
// Process parameters
|
|
var parameter = $tw.utils.parseMacroParameter(source,pos);
|
|
while(parameter) {
|
|
node.params.push(parameter);
|
|
pos = parameter.end;
|
|
// Get the next parameter
|
|
parameter = $tw.utils.parseMacroParameter(source,pos);
|
|
}
|
|
// Skip whitespace
|
|
pos = $tw.utils.skipWhiteSpace(source,pos);
|
|
// Look for a double greater than sign
|
|
token = $tw.utils.parseTokenString(source,pos,">>");
|
|
if(!token) {
|
|
return null;
|
|
}
|
|
pos = token.end;
|
|
// Update the end position
|
|
node.end = pos;
|
|
return node;
|
|
};
|
|
|
|
/*
|
|
Look for an HTML attribute definition. Returns null if not found, otherwise returns {type: "attribute", name:, valueType: "string|indirect|macro", value:, start:, end:,}
|
|
*/
|
|
exports.parseAttribute = function(source,pos) {
|
|
var node = {
|
|
start: pos
|
|
};
|
|
// Define our regexps
|
|
var reAttributeName = /([^\/\s>"'=]+)/g,
|
|
reUnquotedAttribute = /([^\/\s<>"'=]+)/g,
|
|
reFilteredValue = /\{\{\{(.+?)\}\}\}/g,
|
|
reIndirectValue = /\{\{([^\}]+)\}\}/g;
|
|
// Skip whitespace
|
|
pos = $tw.utils.skipWhiteSpace(source,pos);
|
|
// Get the attribute name
|
|
var name = $tw.utils.parseTokenRegExp(source,pos,reAttributeName);
|
|
if(!name) {
|
|
return null;
|
|
}
|
|
node.name = name.match[1];
|
|
pos = name.end;
|
|
// Skip whitespace
|
|
pos = $tw.utils.skipWhiteSpace(source,pos);
|
|
// Look for an equals sign
|
|
var token = $tw.utils.parseTokenString(source,pos,"=");
|
|
if(token) {
|
|
pos = token.end;
|
|
// Skip whitespace
|
|
pos = $tw.utils.skipWhiteSpace(source,pos);
|
|
// Look for a string literal
|
|
var stringLiteral = $tw.utils.parseStringLiteral(source,pos);
|
|
if(stringLiteral) {
|
|
pos = stringLiteral.end;
|
|
node.type = "string";
|
|
node.value = stringLiteral.value;
|
|
} else {
|
|
// Look for a filtered value
|
|
var filteredValue = $tw.utils.parseTokenRegExp(source,pos,reFilteredValue);
|
|
if(filteredValue) {
|
|
pos = filteredValue.end;
|
|
node.type = "filtered";
|
|
node.filter = filteredValue.match[1];
|
|
} else {
|
|
// Look for an indirect value
|
|
var indirectValue = $tw.utils.parseTokenRegExp(source,pos,reIndirectValue);
|
|
if(indirectValue) {
|
|
pos = indirectValue.end;
|
|
node.type = "indirect";
|
|
node.textReference = indirectValue.match[1];
|
|
} else {
|
|
// Look for a unquoted value
|
|
var unquotedValue = $tw.utils.parseTokenRegExp(source,pos,reUnquotedAttribute);
|
|
if(unquotedValue) {
|
|
pos = unquotedValue.end;
|
|
node.type = "string";
|
|
node.value = unquotedValue.match[1];
|
|
} else {
|
|
// Look for a macro invocation value
|
|
var macroInvocation = $tw.utils.parseMacroInvocation(source,pos);
|
|
if(macroInvocation) {
|
|
pos = macroInvocation.end;
|
|
node.type = "macro";
|
|
node.value = macroInvocation;
|
|
} else {
|
|
node.type = "string";
|
|
node.value = "true";
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
node.type = "string";
|
|
node.value = "true";
|
|
}
|
|
// Update the end position
|
|
node.end = pos;
|
|
return node;
|
|
};
|
|
|
|
})();
|