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183 lines (155 loc) · 6.26 KB
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/* ***** BEGIN LICENSE BLOCK *****
* Distributed under the BSD license:
*
* Copyright (c) 2010, Ajax.org B.V.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Ajax.org B.V. nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL AJAX.ORG B.V. BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ***** END LICENSE BLOCK ***** */
define(function(require, exports, module) {
var BaseTokenizer = require("./tokenizer").Tokenizer;
// tokenizing lines longer than this makes editor very slow
var MAX_TOKEN_COUNT = 100000;
/*
* version of Tokenizer with additional logging
* and infinite loop checks
* can be used for developing/testing new modes
**/
var Tokenizer = function(rules) {
BaseTokenizer.call(this, rules);
/**
* Returns an object containing two properties: `tokens`, which contains all the tokens; and `state`, the current state.
* @returns {Object}
**/
this.getLineTokens = function(line, startState) {
if (startState && typeof startState != "string") {
var stack = startState.slice(0);
startState = stack[0];
} else
var stack = [];
var currentState = startState || "start";
var state = this.states[currentState];
var mapping = this.matchMappings[currentState];
var re = this.regExps[currentState];
re.lastIndex = 0;
var match, tokens = [];
var lastIndex = 0;
var stateTransitions = [];
function onStateChange() {
stateTransitions.push(startState+"@"+lastIndex);
}
function initState() {
onStateChange();
stateTransitions = [];
onStateChange();
}
var token = {
type: null,
value: "",
state: currentState
};
initState();
var maxRecur = 100000;
while (match = re.exec(line)) {
var type = mapping.defaultToken;
var rule = null;
var value = match[0];
var index = re.lastIndex;
if (index - value.length > lastIndex) {
var skipped = line.substring(lastIndex, index - value.length);
if (token.type == type) {
token.value += skipped;
} else {
if (token.type)
tokens.push(token);
token = {type: type, value: skipped};
}
}
for (var i = 0; i < match.length-2; i++) {
if (match[i + 1] === undefined)
continue;
if (!maxRecur--) {
throw "infinite" + state[mapping[i]] + currentState
}
rule = state[mapping[i]];
if (rule.onMatch)
type = rule.onMatch(value, currentState, stack);
else
type = rule.token;
if (rule.next) {
if (typeof rule.next == "string")
currentState = rule.next;
else
currentState = rule.next(currentState, stack);
state = this.states[currentState];
if (!state) {
window.console && console.error && console.error(currentState, "doesn't exist");
currentState = "start";
state = this.states[currentState];
}
mapping = this.matchMappings[currentState];
lastIndex = index;
re = this.regExps[currentState];
re.lastIndex = index;
onStateChange();
}
break;
}
if (value) {
if (typeof type == "string") {
if ((!rule || rule.merge !== false) && token.type === type) {
token.value += value;
} else {
if (token.type)
tokens.push(token);
token = {type: type, value: value};
}
} else {
if (token.type)
tokens.push(token);
token = {type: null, value: ""};
for (var i = 0; i < type.length; i++)
tokens.push(type[i]);
}
}
if (lastIndex == line.length)
break;
lastIndex = index;
if (tokens.length > MAX_TOKEN_COUNT) {
token.value += line.substr(lastIndex);
currentState = "start"
break;
}
}
if (token.type)
tokens.push(token);
return {
tokens : tokens,
state : stack.length ? stack : currentState
};
};
};
Tokenizer.prototype = BaseTokenizer.prototype;
exports.Tokenizer = Tokenizer;
});