37 lines
844 B
JavaScript
37 lines
844 B
JavaScript
'use strict'
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module.exports = factory
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var backslash = '\\'
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// Factory to de-escape a value, based on a list at `key` in `ctx`.
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function factory(ctx, key) {
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return unescape
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// De-escape a string using the expression at `key` in `ctx`.
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function unescape(value) {
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var previous = 0
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var index = value.indexOf(backslash)
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var escape = ctx[key]
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var queue = []
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var character
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while (index !== -1) {
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queue.push(value.slice(previous, index))
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previous = index + 1
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character = value.charAt(previous)
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// If the following character is not a valid escape, add the slash.
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if (!character || escape.indexOf(character) === -1) {
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queue.push(backslash)
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}
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index = value.indexOf(backslash, previous + 1)
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}
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queue.push(value.slice(previous))
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return queue.join('')
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}
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}
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