118 lines
2.9 KiB
JavaScript
118 lines
2.9 KiB
JavaScript
var EscapeStore = require('./escape-store');
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var EXPRESSION_NAME = 'expression';
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var EXPRESSION_START = '(';
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var EXPRESSION_END = ')';
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var EXPRESSION_PREFIX = EXPRESSION_NAME + EXPRESSION_START;
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var BODY_START = '{';
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var BODY_END = '}';
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var lineBreak = require('os').EOL;
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function findEnd(data, start) {
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var end = start + EXPRESSION_NAME.length;
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var level = 0;
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var quoted = false;
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var braced = false;
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while (true) {
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var current = data[end++];
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if (quoted) {
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quoted = current != '\'' && current != '"';
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} else {
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quoted = current == '\'' || current == '"';
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if (current == EXPRESSION_START)
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level++;
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if (current == EXPRESSION_END)
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level--;
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if (current == BODY_START)
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braced = true;
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if (current == BODY_END && !braced && level == 1) {
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end--;
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level--;
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}
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}
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if (level === 0 && current == EXPRESSION_END)
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break;
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if (!current) {
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end = data.substring(0, end).lastIndexOf(BODY_END);
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break;
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}
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}
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return end;
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}
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function ExpressionsProcessor(saveWaypoints) {
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this.expressions = new EscapeStore('EXPRESSION');
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this.saveWaypoints = saveWaypoints;
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}
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ExpressionsProcessor.prototype.escape = function (data) {
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var nextStart = 0;
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var nextEnd = 0;
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var cursor = 0;
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var tempData = [];
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var indent = 0;
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var breaksCount;
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var lastBreakAt;
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var newIndent;
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var saveWaypoints = this.saveWaypoints;
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for (; nextEnd < data.length;) {
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nextStart = data.indexOf(EXPRESSION_PREFIX, nextEnd);
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if (nextStart == -1)
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break;
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nextEnd = findEnd(data, nextStart);
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var expression = data.substring(nextStart, nextEnd);
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if (saveWaypoints) {
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breaksCount = expression.split(lineBreak).length - 1;
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lastBreakAt = expression.lastIndexOf(lineBreak);
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newIndent = lastBreakAt > 0 ?
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expression.substring(lastBreakAt + lineBreak.length).length :
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indent + expression.length;
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}
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var metadata = saveWaypoints ? [breaksCount, newIndent] : null;
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var placeholder = this.expressions.store(expression, metadata);
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tempData.push(data.substring(cursor, nextStart));
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tempData.push(placeholder);
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if (saveWaypoints)
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indent = newIndent + 1;
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cursor = nextEnd;
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}
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return tempData.length > 0 ?
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tempData.join('') + data.substring(cursor, data.length) :
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data;
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};
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ExpressionsProcessor.prototype.restore = function (data) {
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var tempData = [];
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var cursor = 0;
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for (; cursor < data.length;) {
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var nextMatch = this.expressions.nextMatch(data, cursor);
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if (nextMatch.start < 0)
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break;
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tempData.push(data.substring(cursor, nextMatch.start));
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var comment = this.expressions.restore(nextMatch.match);
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tempData.push(comment);
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cursor = nextMatch.end;
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}
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return tempData.length > 0 ?
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tempData.join('') + data.substring(cursor, data.length) :
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data;
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};
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module.exports = ExpressionsProcessor;
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