/**
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* util-deps.js - The parser for dependencies
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* ref: tests/research/parse-dependencies/test.html
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* ref: https://github.com/seajs/crequire
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*/
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function parseDependencies(s, replace, includeAsync) {
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if(replace === true) {
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includeAsync = true;
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replace = null;
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}
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if(s.indexOf('require') == -1 && s.indexOf('import') == -1) {
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return replace ? s : [];
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}
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var index = 0, peek, length = s.length, isReg = 1, modName = 0, res = []
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var parentheseState = 0, parentheseStack = []
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var braceState, braceStack = [], isReturn
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var last
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var flag
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var quote
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while(index < length) {
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readch()
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if(isBlank()) {
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if(isReturn && (peek == '\n' || peek == '\r')) {
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braceState = 0
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isReturn = 0
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}
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}
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else if(isQuote()) {
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dealQuote()
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isReg = 1
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isReturn = 0
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braceState = 0
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}
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else if(peek == '/') {
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readch()
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if(peek == '/') {
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index = s.indexOf('\n', index)
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if(index == -1) {
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index = s.length
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}
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}
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else if(peek == '*') {
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var i = s.indexOf('\n', index)
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index = s.indexOf('*/', index)
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if(index == -1) {
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index = length
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}
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else {
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index += 2
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}
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if(isReturn && i != -1 && i < index) {
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braceState = 0
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isReturn = 0
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}
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}
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else if(isReg) {
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dealReg()
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isReg = 0
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isReturn = 0
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braceState = 0
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}
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else {
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index--
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isReg = 1
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isReturn = 0
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braceState = 1
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}
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}
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else if(isWord()) {
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dealWord()
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}
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else if(isNumber()) {
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dealNumber()
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isReturn = 0
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braceState = 0
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}
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else if(peek == '(') {
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parentheseStack.push(parentheseState)
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isReg = 1
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isReturn = 0
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braceState = 1
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}
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else if(peek == ')') {
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isReg = parentheseStack.pop()
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isReturn = 0
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braceState = 0
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}
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else if(peek == '{') {
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if(isReturn) {
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braceState = 1
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}
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braceStack.push(braceState)
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isReturn = 0
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isReg = 1
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}
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else if(peek == '}') {
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braceState = braceStack.pop();
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isReg = !braceState
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isReturn = 0
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}
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else {
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var next = s.charAt(index)
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if(peek == ';') {
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braceState = 0
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}
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else if(peek == '-' && next == '-'
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|| peek == '+' && next == '+'
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|| peek == '=' && next == '>') {
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braceState = 0
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index++
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}
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else {
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braceState = 1
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}
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isReg = peek != ']'
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isReturn = 0
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}
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}
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return replace ? s : res
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function readch() {
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peek = s.charAt(index++)
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}
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function isBlank() {
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return /\s/.test(peek)
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}
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function isQuote() {
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return peek == '"' || peek == "'"
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}
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function dealQuote() {
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var start = index
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var c = peek
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var end = s.indexOf(c, start)
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if(end == -1) {
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index = length
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}
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else if(s.charAt(end - 1) != '\\') {
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index = end + 1
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}
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else {
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while(index < length) {
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readch()
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if(peek == '\\') {
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index++
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}
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else if(peek == c) {
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break
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}
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}
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}
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if(modName) {
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var d = {
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'string': modName == 2
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? s.slice(last, index)
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: s.slice(last, s.indexOf(')', index) + 1),
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'path': s.slice(start, index - 1),
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'index': last,
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'flag': flag
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}
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res.push(d)
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if(replace) {
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var rep = replace(d)
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s = s.slice(0, last) + rep + s.slice(last + d.string.length)
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if(rep.length != d.string.length) {
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index = last + rep.length
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length = s.length
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}
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}
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modName = 0
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}
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}
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function dealReg() {
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index--
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while(index < length) {
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readch()
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if(peek == '\\') {
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index++
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}
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else if(peek == '/') {
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break
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}
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else if(peek == '[') {
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while(index < length) {
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readch()
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if(peek == '\\') {
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index++
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}
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else if(peek == ']') {
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break
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}
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}
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}
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}
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}
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function isWord() {
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return /[a-z_$]/i.test(peek)
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}
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function dealWord() {
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var s2 = s.slice(index - 1)
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var r = /^[\w$]+/.exec(s2)[0]
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parentheseState = {
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'if': 1,
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'for': 1,
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'while': 1,
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'with': 1
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}[r]
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isReg = {
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'break': 1,
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'case': 1,
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'continue': 1,
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'debugger': 1,
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'delete': 1,
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'do': 1,
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'else': 1,
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'false': 1,
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'if': 1,
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'in': 1,
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'instanceof': 1,
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'return': 1,
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'typeof': 1,
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'void': 1
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}[r]
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isReturn = r == 'return'
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braceState = {
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'instanceof': 1,
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'delete': 1,
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'void': 1,
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'typeof': 1,
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'return': 1
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}.hasOwnProperty(r)
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if(r == 'require') {
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modName = includeAsync
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? /^require\s*(?:\/\*[\s\S]*?\*\/\s*)?[.\w$]*\s*(?:\/\*[\s\S]*?\*\/\s*)?\(\s*(['"]).+?\1\s*[),]/.test(s2)
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: /^require\s*(?:\/\*[\s\S]*?\*\/\s*)?\(\s*(['"]).+?\1\s*[),]/.test(s2)
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}
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else if(r == 'import') {
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// ignore `{ import() {} }`
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modName = /^import[^(]*?['"]/.test(s2);
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if (modName) modName = 2;
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}
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if(modName) {
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last = index - 1
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if(r == 'require') {
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r = includeAsync
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? /^require\s*(?:\/\*[\s\S]*?\*\/\s*)?[.\w$]*\s*(?:\/\*[\s\S]*?\*\/\s*)?\(\s*['"]/.exec(s2)[0]
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: /^require\s*(?:\/\*[\s\S]*?\*\/\s*)?\(\s*['"]/.exec(s2)[0]
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index += r.length - 2
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flag = /^require\s*(?:\/\*[\s\S]*?\*\/\s*)?([.\w$]+)/.test(s2)
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? /^require\s*(?:\/\*[\s\S]*?\*\/\s*)?([.\w$]+)/.exec(s2)[1]
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: null
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}
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else if (r === 'import') {
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r = /^import[^(]*?['"]/.exec(s2)[0];
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index += r.length - 2
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quote = r.charAt(r.length - 1)
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}
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}
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else {
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index += /^[\w$]+(?:\s*\.\s*[\w$]+)*/.exec(s2)[0].length - 1
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}
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}
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function isNumber() {
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return /\d/.test(peek)
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|| peek == '.' && /\d/.test(s.charAt(index))
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}
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function dealNumber() {
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var s2 = s.slice(index - 1)
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var r
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if(peek == '.') {
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r = /^\.\d+(?:E[+-]?\d*)?\s*/i.exec(s2)[0]
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}
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else if(/^0x[\da-f]*/i.test(s2)) {
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r = /^0x[\da-f]*\s*/i.exec(s2)[0]
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}
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else {
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r = /^\d+\.?\d*(?:E[+-]?\d*)?\s*/i.exec(s2)[0]
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}
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index += r.length - 1
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isReg = 0
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}
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}
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module.exports = parseDependencies
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