work.suroh.tk/node_modules/character-parser/index.js

297 lines
8.8 KiB
JavaScript

'use strict';
var objIsRegex = require('is-regex');
exports = (module.exports = parse);
var TOKEN_TYPES = exports.TOKEN_TYPES = {
LINE_COMMENT: '//',
BLOCK_COMMENT: '/**/',
SINGLE_QUOTE: '\'',
DOUBLE_QUOTE: '"',
TEMPLATE_QUOTE: '`',
REGEXP: '//g'
}
var BRACKETS = exports.BRACKETS = {
'(': ')',
'{': '}',
'[': ']'
};
var BRACKETS_REVERSED = {
')': '(',
'}': '{',
']': '['
};
exports.parse = parse;
function parse(src, state, options) {
options = options || {};
state = state || exports.defaultState();
var start = options.start || 0;
var end = options.end || src.length;
var index = start;
while (index < end) {
try {
parseChar(src[index], state);
} catch (ex) {
ex.index = index;
throw ex;
}
index++;
}
return state;
}
exports.parseUntil = parseUntil;
function parseUntil(src, delimiter, options) {
options = options || {};
var start = options.start || 0;
var index = start;
var state = exports.defaultState();
while (index < src.length) {
if ((options.ignoreNesting || !state.isNesting(options)) && matches(src, delimiter, index)) {
var end = index;
return {
start: start,
end: end,
src: src.substring(start, end)
};
}
try {
parseChar(src[index], state);
} catch (ex) {
ex.index = index;
throw ex;
}
index++;
}
var err = new Error('The end of the string was reached with no closing bracket found.');
err.code = 'CHARACTER_PARSER:END_OF_STRING_REACHED';
err.index = index;
throw err;
}
exports.parseChar = parseChar;
function parseChar(character, state) {
if (character.length !== 1) {
var err = new Error('Character must be a string of length 1');
err.name = 'InvalidArgumentError';
err.code = 'CHARACTER_PARSER:CHAR_LENGTH_NOT_ONE';
throw err;
}
state = state || exports.defaultState();
state.src += character;
var wasComment = state.isComment();
var lastChar = state.history ? state.history[0] : '';
if (state.regexpStart) {
if (character === '/' || character == '*') {
state.stack.pop();
}
state.regexpStart = false;
}
switch (state.current()) {
case TOKEN_TYPES.LINE_COMMENT:
if (character === '\n') {
state.stack.pop();
}
break;
case TOKEN_TYPES.BLOCK_COMMENT:
if (state.lastChar === '*' && character === '/') {
state.stack.pop();
}
break;
case TOKEN_TYPES.SINGLE_QUOTE:
if (character === '\'' && !state.escaped) {
state.stack.pop();
} else if (character === '\\' && !state.escaped) {
state.escaped = true;
} else {
state.escaped = false;
}
break;
case TOKEN_TYPES.DOUBLE_QUOTE:
if (character === '"' && !state.escaped) {
state.stack.pop();
} else if (character === '\\' && !state.escaped) {
state.escaped = true;
} else {
state.escaped = false;
}
break;
case TOKEN_TYPES.TEMPLATE_QUOTE:
if (character === '`' && !state.escaped) {
state.stack.pop();
state.hasDollar = false;
} else if (character === '\\' && !state.escaped) {
state.escaped = true;
state.hasDollar = false;
} else if (character === '$' && !state.escaped) {
state.hasDollar = true;
} else if (character === '{' && state.hasDollar) {
state.stack.push(BRACKETS[character]);
} else {
state.escaped = false;
state.hasDollar = false;
}
break;
case TOKEN_TYPES.REGEXP:
if (character === '/' && !state.escaped) {
state.stack.pop();
} else if (character === '\\' && !state.escaped) {
state.escaped = true;
} else {
state.escaped = false;
}
break;
default:
if (character in BRACKETS) {
state.stack.push(BRACKETS[character]);
} else if (character in BRACKETS_REVERSED) {
if (state.current() !== character) {
var err = new SyntaxError('Mismatched Bracket: ' + character);
err.code = 'CHARACTER_PARSER:MISMATCHED_BRACKET';
throw err;
};
state.stack.pop();
} else if (lastChar === '/' && character === '/') {
// Don't include comments in history
state.history = state.history.substr(1);
state.stack.push(TOKEN_TYPES.LINE_COMMENT);
} else if (lastChar === '/' && character === '*') {
// Don't include comment in history
state.history = state.history.substr(1);
state.stack.push(TOKEN_TYPES.BLOCK_COMMENT);
} else if (character === '/' && isRegexp(state.history)) {
state.stack.push(TOKEN_TYPES.REGEXP);
// N.B. if the next character turns out to be a `*` or a `/`
// then this isn't actually a regexp
state.regexpStart = true;
} else if (character === '\'') {
state.stack.push(TOKEN_TYPES.SINGLE_QUOTE);
} else if (character === '"') {
state.stack.push(TOKEN_TYPES.DOUBLE_QUOTE);
} else if (character === '`') {
state.stack.push(TOKEN_TYPES.TEMPLATE_QUOTE);
}
break;
}
if (!state.isComment() && !wasComment) {
state.history = character + state.history;
}
state.lastChar = character; // store last character for ending block comments
return state;
}
exports.defaultState = function () { return new State() };
function State() {
this.stack = [];
this.regexpStart = false;
this.escaped = false;
this.hasDollar = false;
this.src = '';
this.history = ''
this.lastChar = ''
}
State.prototype.current = function () {
return this.stack[this.stack.length - 1];
};
State.prototype.isString = function () {
return (
this.current() === TOKEN_TYPES.SINGLE_QUOTE ||
this.current() === TOKEN_TYPES.DOUBLE_QUOTE ||
this.current() === TOKEN_TYPES.TEMPLATE_QUOTE
);
}
State.prototype.isComment = function () {
return this.current() === TOKEN_TYPES.LINE_COMMENT || this.current() === TOKEN_TYPES.BLOCK_COMMENT;
}
State.prototype.isNesting = function (opts) {
if (
opts && opts.ignoreLineComment &&
this.stack.length === 1 && this.stack[0] === TOKEN_TYPES.LINE_COMMENT
) {
// if we are only inside a line comment, and line comments are ignored
// don't count it as nesting
return false;
}
return !!this.stack.length;
}
function matches(str, matcher, i) {
if (objIsRegex(matcher)) {
return matcher.test(str.substr(i || 0));
} else {
return str.substr(i || 0, matcher.length) === matcher;
}
}
exports.isPunctuator = isPunctuator
function isPunctuator(c) {
if (!c) return true; // the start of a string is a punctuator
var code = c.charCodeAt(0)
switch (code) {
case 46: // . dot
case 40: // ( open bracket
case 41: // ) close bracket
case 59: // ; semicolon
case 44: // , comma
case 123: // { open curly brace
case 125: // } close curly brace
case 91: // [
case 93: // ]
case 58: // :
case 63: // ?
case 126: // ~
case 37: // %
case 38: // &
case 42: // *:
case 43: // +
case 45: // -
case 47: // /
case 60: // <
case 62: // >
case 94: // ^
case 124: // |
case 33: // !
case 61: // =
return true;
default:
return false;
}
}
exports.isKeyword = isKeyword
function isKeyword(id) {
return (id === 'if') || (id === 'in') || (id === 'do') || (id === 'var') || (id === 'for') || (id === 'new') ||
(id === 'try') || (id === 'let') || (id === 'this') || (id === 'else') || (id === 'case') ||
(id === 'void') || (id === 'with') || (id === 'enum') || (id === 'while') || (id === 'break') || (id === 'catch') ||
(id === 'throw') || (id === 'const') || (id === 'yield') || (id === 'class') || (id === 'super') ||
(id === 'return') || (id === 'typeof') || (id === 'delete') || (id === 'switch') || (id === 'export') ||
(id === 'import') || (id === 'default') || (id === 'finally') || (id === 'extends') || (id === 'function') ||
(id === 'continue') || (id === 'debugger') || (id === 'package') || (id === 'private') || (id === 'interface') ||
(id === 'instanceof') || (id === 'implements') || (id === 'protected') || (id === 'public') || (id === 'static');
}
function isRegexp(history) {
//could be start of regexp or divide sign
history = history.replace(/^\s*/, '');
//unless its an `if`, `while`, `for` or `with` it's a divide, so we assume it's a divide
if (history[0] === ')') return false;
//unless it's a function expression, it's a regexp, so we assume it's a regexp
if (history[0] === '}') return true;
//any punctuation means it's a regexp
if (isPunctuator(history[0])) return true;
//if the last thing was a keyword then it must be a regexp (e.g. `typeof /foo/`)
if (/^\w+\b/.test(history) && isKeyword(/^\w+\b/.exec(history)[0].split('').reverse().join(''))) return true;
return false;
}