143 lines
3.8 KiB
JavaScript
143 lines
3.8 KiB
JavaScript
var template = require("./index")
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var whitespaceRegex = /["'\\\n\r\u2028\u2029]/g
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var nargs = /\{[0-9a-zA-Z]+\}/g
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var replaceTemplate =
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" var args\n" +
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" var result\n" +
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" if (arguments.length === 1 && typeof arguments[0] === \"object\") {\n" +
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" args = arguments[0]\n" +
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" } else {\n" +
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" args = arguments" +
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" }\n\n" +
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" if (!args || !(\"hasOwnProperty\" in args)) {\n" +
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" args = {}\n" +
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" }\n\n" +
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" return {0}"
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var literalTemplate = "\"{0}\""
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var argTemplate = "(result = args.hasOwnProperty(\"{0}\") ? " +
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"args[\"{0}\"] : null, \n " +
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"(result === null || result === undefined) ? \"\" : result)"
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module.exports = compile
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function compile(string, inline) {
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var replacements = string.match(nargs) || []
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var interleave = string.split(nargs)
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var replace = []
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for (var i = 0; i < interleave.length; i++) {
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var current = interleave[i]
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var replacement = replacements[i]
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var escapeLeft = current.charAt(current.length - 1)
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var escapeRight = (interleave[i + 1] || "").charAt(0)
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if (replacement) {
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replacement = replacement.substring(1, replacement.length - 1)
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}
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if (escapeLeft === "{" && escapeRight === "}") {
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replace.push(current + replacement)
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} else {
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replace.push(current)
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if (replacement) {
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replace.push({ name: replacement })
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}
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}
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}
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var prev = [""]
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for (var j = 0; j < replace.length; j++) {
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var curr = replace[j]
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if (String(curr) === curr) {
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var top = prev[prev.length - 1]
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if (String(top) === top) {
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prev[prev.length - 1] = top + curr
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} else {
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prev.push(curr)
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}
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} else {
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prev.push(curr)
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}
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}
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replace = prev
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if (inline) {
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for (var k = 0; k < replace.length; k++) {
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var token = replace[k]
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if (String(token) === token) {
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replace[k] = template(literalTemplate, escape(token))
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} else {
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replace[k] = template(argTemplate, escape(token.name))
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}
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}
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var replaceCode = replace.join(" +\n ")
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var compiledSource = template(replaceTemplate, replaceCode)
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return new Function(compiledSource)
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}
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return function template() {
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var args
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if (arguments.length === 1 && typeof arguments[0] === "object") {
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args = arguments[0]
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} else {
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args = arguments
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}
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if (!args || !("hasOwnProperty" in args)) {
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args = {}
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}
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var result = []
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for (var i = 0; i < replace.length; i++) {
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if (i % 2 === 0) {
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result.push(replace[i])
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} else {
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var argName = replace[i].name
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var arg = args.hasOwnProperty(argName) ? args[argName] : null
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if (arg !== null || arg !== undefined) {
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result.push(arg)
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}
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}
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}
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return result.join("")
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}
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}
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function escape(string) {
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string = '' + string
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return string.replace(whitespaceRegex, escapedWhitespace)
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}
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function escapedWhitespace(character) {
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// Escape all characters not included in SingleStringCharacters and
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// DoubleStringCharacters on
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// http://www.ecma-international.org/ecma-262/5.1/#sec-7.8.4
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switch (character) {
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case '"':
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case "'":
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case '\\':
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return '\\' + character
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// Four possible LineTerminator characters need to be escaped:
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case '\n':
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return '\\n'
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case '\r':
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return '\\r'
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case '\u2028':
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return '\\u2028'
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case '\u2029':
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return '\\u2029'
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}
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}
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