mirror of
https://github.com/jashkenas/coffeescript.git
synced 2022-11-09 12:23:24 -05:00
615 lines
24 KiB
JavaScript
615 lines
24 KiB
JavaScript
(function(){
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var ACCESSORS, ASSIGNMENT, BEFORE_WHEN, CALLABLE, CODE, COFFEE_KEYWORDS, COMMENT, COMMENT_CLEANER, HEREDOC, HEREDOC_INDENT, IDENTIFIER, INTERPOLATION, JS_CLEANER, JS_FORBIDDEN, JS_KEYWORDS, KEYWORDS, LAST_DENT, LAST_DENTS, Lexer, MULTILINER, MULTI_DENT, NOT_REGEX, NO_NEWLINE, NUMBER, OPERATOR, REGEX_ESCAPE, REGEX_FLAGS, REGEX_INTERPOLATION, REGEX_START, RESERVED, Rewriter, STRING_NEWLINES, WHITESPACE, balanced_string, compact, count, helpers, include, starts;
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// The CoffeeScript Lexer. Uses a series of token-matching regexes to attempt
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// matches against the beginning of the source code. When a match is found,
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// a token is produced, we consume the match, and start again. Tokens are in the
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// form:
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// [tag, value, line_number]
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// Which is a format that can be fed directly into [Jison](http://github.com/zaach/jison).
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// Set up the Lexer for both Node.js and the browser, depending on where we are.
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if ((typeof process !== "undefined" && process !== null)) {
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Rewriter = require('./rewriter').Rewriter;
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helpers = require('./helpers').helpers;
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} else {
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this.exports = this;
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Rewriter = this.Rewriter;
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helpers = this.helpers;
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}
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// Import the helpers we need.
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include = helpers.include;
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count = helpers.count;
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starts = helpers.starts;
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compact = helpers.compact;
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balanced_string = helpers.balanced_string;
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// The Lexer Class
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// ---------------
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// The Lexer class reads a stream of CoffeeScript and divvys it up into tagged
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// tokens. Some potential ambiguity in the grammar has been avoided by
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// pushing some extra smarts into the Lexer.
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exports.Lexer = (function() {
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Lexer = function Lexer() { };
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// **tokenize** is the Lexer's main method. Scan by attempting to match tokens
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// one at a time, using a regular expression anchored at the start of the
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// remaining code, or a custom recursive token-matching method
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// (for interpolations). When the next token has been recorded, we move forward
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// within the code past the token, and begin again.
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// Each tokenizing method is responsible for incrementing `@i` by the number of
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// characters it has consumed. `@i` can be thought of as our finger on the page
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// of source.
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// Before returning the token stream, run it through the [Rewriter](rewriter.html)
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// unless explicitly asked not to.
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Lexer.prototype.tokenize = function tokenize(code, options) {
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var o;
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code = code.replace(/(\r|\s+$)/g, '');
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o = options || {};
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this.code = code;
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// The remainder of the source code.
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this.i = 0;
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// Current character position we're parsing.
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this.line = o.line || 0;
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// The current line.
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this.indent = 0;
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// The current indentation level.
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this.indents = [];
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// The stack of all current indentation levels.
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this.tokens = [];
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// Stream of parsed tokens in the form ['TYPE', value, line]
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while (this.i < this.code.length) {
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this.chunk = this.code.slice(this.i);
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this.extract_next_token();
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}
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this.close_indentation();
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if (o.rewrite === false) {
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return this.tokens;
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}
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return (new Rewriter()).rewrite(this.tokens);
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};
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// At every position, run through this list of attempted matches,
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// short-circuiting if any of them succeed. Their order determines precedence:
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// `@literal_token` is the fallback catch-all.
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Lexer.prototype.extract_next_token = function extract_next_token() {
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if (this.extension_token()) {
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return null;
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}
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if (this.identifier_token()) {
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return null;
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}
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if (this.number_token()) {
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return null;
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}
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if (this.heredoc_token()) {
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return null;
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}
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if (this.regex_token()) {
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return null;
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}
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if (this.comment_token()) {
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return null;
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}
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if (this.line_token()) {
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return null;
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}
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if (this.whitespace_token()) {
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return null;
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}
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if (this.js_token()) {
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return null;
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}
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if (this.string_token()) {
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return null;
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}
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return this.literal_token();
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};
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// Tokenizers
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// ----------
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// Language extensions get the highest priority, first chance to tag tokens
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// as something else.
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Lexer.prototype.extension_token = function extension_token() {
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var _a, _b, _c, extension;
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_a = Lexer.extensions;
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for (_b = 0, _c = _a.length; _b < _c; _b++) {
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extension = _a[_b];
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if (extension.call(this)) {
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return true;
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}
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}
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return false;
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};
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// Matches identifying literals: variables, keywords, method names, etc.
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// Check to ensure that JavaScript reserved words aren't being used as
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// identifiers. Because CoffeeScript reserves a handful of keywords that are
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// allowed in JavaScript, we're careful not to tag them as keywords when
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// referenced as property names here, so you can still do `jQuery.is()` even
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// though `is` means `===` otherwise.
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Lexer.prototype.identifier_token = function identifier_token() {
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var id, tag;
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if (!((id = this.match(IDENTIFIER, 1)))) {
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return false;
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}
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this.name_access_type();
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tag = 'IDENTIFIER';
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if (include(KEYWORDS, id) && !(include(ACCESSORS, this.tag(0)) && !this.prev().spaced)) {
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tag = id.toUpperCase();
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}
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if (include(RESERVED, id)) {
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this.identifier_error(id);
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}
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if (tag === 'WHEN' && include(BEFORE_WHEN, this.tag())) {
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tag = 'LEADING_WHEN';
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}
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this.token(tag, id);
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this.i += id.length;
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return true;
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};
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// Matches numbers, including decimals, hex, and exponential notation.
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Lexer.prototype.number_token = function number_token() {
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var number;
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if (!((number = this.match(NUMBER, 1)))) {
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return false;
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}
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this.token('NUMBER', number);
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this.i += number.length;
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return true;
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};
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// Matches strings, including multi-line strings. Ensures that quotation marks
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// are balanced within the string's contents, and within nested interpolations.
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Lexer.prototype.string_token = function string_token() {
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var string;
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if (!(starts(this.chunk, '"') || starts(this.chunk, "'"))) {
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return false;
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}
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if (!((string = this.balanced_token(['"', '"'], ['${', '}']) || this.balanced_token(["'", "'"])))) {
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return false;
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}
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this.interpolate_string(string.replace(STRING_NEWLINES, " \\\n"));
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this.line += count(string, "\n");
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this.i += string.length;
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return true;
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};
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// Matches heredocs, adjusting indentation to the correct level, as heredocs
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// preserve whitespace, but ignore indentation to the left.
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Lexer.prototype.heredoc_token = function heredoc_token() {
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var doc, match;
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if (!((match = this.chunk.match(HEREDOC)))) {
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return false;
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}
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doc = this.sanitize_heredoc(match[2] || match[4]);
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this.token('STRING', "\"" + doc + "\"");
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this.line += count(match[1], "\n");
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this.i += match[1].length;
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return true;
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};
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// Matches JavaScript interpolated directly into the source via backticks.
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Lexer.prototype.js_token = function js_token() {
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var script;
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if (!(starts(this.chunk, '`'))) {
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return false;
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}
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if (!((script = this.balanced_token(['`', '`'])))) {
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return false;
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}
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this.token('JS', script.replace(JS_CLEANER, ''));
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this.i += script.length;
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return true;
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};
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// Matches regular expression literals. Lexing regular expressions is difficult
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// to distinguish from division, so we borrow some basic heuristics from
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// JavaScript and Ruby, borrow slash balancing from `@balanced_token`, and
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// borrow interpolation from `@interpolate_string`.
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Lexer.prototype.regex_token = function regex_token() {
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var flags, regex, str;
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if (!(this.chunk.match(REGEX_START))) {
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return false;
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}
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if (include(NOT_REGEX, this.tag())) {
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return false;
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}
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if (!((regex = this.balanced_token(['/', '/'])))) {
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return false;
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}
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regex += ((flags = this.chunk.substr(regex.length).match(REGEX_FLAGS)));
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if (regex.match(REGEX_INTERPOLATION)) {
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str = regex.substring(1).split('/')[0];
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str = str.replace(REGEX_ESCAPE, function(escaped) {
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return '\\' + escaped;
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});
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this.tokens = this.tokens.concat([['(', '('], ['NEW', 'new'], ['IDENTIFIER', 'RegExp'], ['CALL_START', '(']]);
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this.interpolate_string("\"" + str + "\"", true);
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this.tokens = this.tokens.concat([[',', ','], ['STRING', "'" + flags + "'"], [')', ')'], [')', ')']]);
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} else {
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this.token('REGEX', regex);
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}
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this.i += regex.length;
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return true;
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};
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// Matches a token in which which the passed delimiter pairs must be correctly
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// balanced (ie. strings, JS literals).
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Lexer.prototype.balanced_token = function balanced_token() {
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var delimited;
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delimited = Array.prototype.slice.call(arguments, 0);
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return balanced_string(this.chunk, delimited);
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};
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// Matches and conumes comments. We pass through comments into JavaScript,
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// so they're treated as real tokens, like any other part of the language.
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Lexer.prototype.comment_token = function comment_token() {
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var comment, lines;
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if (!((comment = this.match(COMMENT, 1)))) {
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return false;
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}
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this.line += (comment.match(MULTILINER) || []).length;
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lines = comment.replace(COMMENT_CLEANER, '').split(MULTILINER);
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this.token('COMMENT', compact(lines));
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this.token('TERMINATOR', "\n");
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this.i += comment.length;
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return true;
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};
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// Matches newlines, indents, and outdents, and determines which is which.
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// If we can detect that the current line is continued onto the the next line,
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// then the newline is suppressed:
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// elements
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// .each( ... )
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// .map( ... )
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// Keeps track of the level of indentation, because a single outdent token
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// can close multiple indents, so we need to know how far in we happen to be.
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Lexer.prototype.line_token = function line_token() {
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var diff, indent, next_character, no_newlines, prev, size;
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if (!((indent = this.match(MULTI_DENT, 1)))) {
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return false;
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}
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this.line += indent.match(MULTILINER).length;
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this.i += indent.length;
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prev = this.prev(2);
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size = indent.match(LAST_DENTS).reverse()[0].match(LAST_DENT)[1].length;
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next_character = this.chunk.match(MULTI_DENT)[4];
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no_newlines = next_character === '.' || (this.value() && this.value().match(NO_NEWLINE) && prev && (prev[0] !== '.') && !this.value().match(CODE));
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if (size === this.indent) {
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if (no_newlines) {
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return this.suppress_newlines();
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}
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return this.newline_token(indent);
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} else if (size > this.indent) {
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if (no_newlines) {
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return this.suppress_newlines();
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}
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diff = size - this.indent;
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this.token('INDENT', diff);
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this.indents.push(diff);
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} else {
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this.outdent_token(this.indent - size, no_newlines);
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}
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this.indent = size;
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return true;
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};
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// Record an outdent token or multiple tokens, if we happen to be moving back
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// inwards past several recorded indents.
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Lexer.prototype.outdent_token = function outdent_token(move_out, no_newlines) {
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var last_indent;
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while (move_out > 0 && this.indents.length) {
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last_indent = this.indents.pop();
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this.token('OUTDENT', last_indent);
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move_out -= last_indent;
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}
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if (!(this.tag() === 'TERMINATOR' || no_newlines)) {
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this.token('TERMINATOR', "\n");
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}
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return true;
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};
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// Matches and consumes non-meaningful whitespace. Tag the previous token
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// as being "spaced", because there are some cases where it makes a difference.
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Lexer.prototype.whitespace_token = function whitespace_token() {
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var prev, space;
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if (!((space = this.match(WHITESPACE, 1)))) {
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return false;
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}
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prev = this.prev();
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if (prev) {
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prev.spaced = true;
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}
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this.i += space.length;
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return true;
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};
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// Generate a newline token. Consecutive newlines get merged together.
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Lexer.prototype.newline_token = function newline_token(newlines) {
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if (!(this.tag() === 'TERMINATOR')) {
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this.token('TERMINATOR', "\n");
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}
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return true;
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};
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// Use a `\` at a line-ending to suppress the newline.
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// The slash is removed here once its job is done.
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Lexer.prototype.suppress_newlines = function suppress_newlines() {
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if (this.value() === "\\") {
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this.tokens.pop();
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}
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return true;
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};
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// We treat all other single characters as a token. Eg.: `( ) , . !`
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// Multi-character operators are also literal tokens, so that Jison can assign
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// the proper order of operations. There are some symbols that we tag specially
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// here. `;` and newlines are both treated as a `TERMINATOR`, we distinguish
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// parentheses that indicate a method call from regular parentheses, and so on.
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Lexer.prototype.literal_token = function literal_token() {
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var match, not_spaced, tag, value;
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match = this.chunk.match(OPERATOR);
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value = match && match[1];
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if (value && value.match(CODE)) {
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this.tag_parameters();
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}
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value = value || this.chunk.substr(0, 1);
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not_spaced = !this.prev() || !this.prev().spaced;
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tag = value;
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if (value.match(ASSIGNMENT)) {
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tag = 'ASSIGN';
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if (include(JS_FORBIDDEN, this.value)) {
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this.assignment_error();
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}
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} else if (value === ';') {
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tag = 'TERMINATOR';
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} else if (value === '[' && this.tag() === '?' && not_spaced) {
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tag = 'SOAKED_INDEX_START';
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this.soaked_index = true;
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this.tokens.pop();
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} else if (value === ']' && this.soaked_index) {
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tag = 'SOAKED_INDEX_END';
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this.soaked_index = false;
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} else if (include(CALLABLE, this.tag()) && not_spaced) {
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if (value === '(') {
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tag = 'CALL_START';
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}
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if (value === '[') {
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tag = 'INDEX_START';
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}
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}
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this.token(tag, value);
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this.i += value.length;
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return true;
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};
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// Token Manipulators
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// ------------------
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// As we consume a new `IDENTIFIER`, look at the previous token to determine
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// if it's a special kind of accessor.
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Lexer.prototype.name_access_type = function name_access_type() {
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if (this.value() === '::') {
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this.tag(1, 'PROTOTYPE_ACCESS');
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}
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if (this.value() === '.' && !(this.value(2) === '.')) {
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if (this.tag(2) === '?') {
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this.tag(1, 'SOAK_ACCESS');
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return this.tokens.splice(-2, 1);
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} else {
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return this.tag(1, 'PROPERTY_ACCESS');
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}
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}
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};
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// Sanitize a heredoc by escaping internal double quotes and erasing all
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// external indentation on the left-hand side.
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Lexer.prototype.sanitize_heredoc = function sanitize_heredoc(doc) {
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var indent;
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indent = (doc.match(HEREDOC_INDENT) || ['']).sort()[0];
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return doc.replace(new RegExp("^" + indent, 'gm'), '').replace(MULTILINER, "\\n").replace(/"/g, '\\"');
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};
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// A source of ambiguity in our grammar used to be parameter lists in function
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// definitions versus argument lists in function calls. Walk backwards, tagging
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// parameters specially in order to make things easier for the parser.
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Lexer.prototype.tag_parameters = function tag_parameters() {
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var _a, i, tok;
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if (this.tag() !== ')') {
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return null;
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}
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i = 0;
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while (true) {
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i += 1;
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tok = this.prev(i);
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if (!tok) {
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return null;
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}
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if ((_a = tok[0]) === 'IDENTIFIER') {
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tok[0] = 'PARAM';
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} else if (_a === ')') {
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tok[0] = 'PARAM_END';
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} else if (_a === '(') {
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return (tok[0] = 'PARAM_START');
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}
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}
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return true;
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};
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// Close up all remaining open blocks at the end of the file.
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Lexer.prototype.close_indentation = function close_indentation() {
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return this.outdent_token(this.indent);
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};
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// The error for when you try to use a forbidden word in JavaScript as
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// an identifier.
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Lexer.prototype.identifier_error = function identifier_error(word) {
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throw new Error("SyntaxError: Reserved word \"" + word + "\" on line " + (this.line + 1));
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};
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// The error for when you try to assign to a reserved word in JavaScript,
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// like "function" or "default".
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Lexer.prototype.assignment_error = function assignment_error() {
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throw new Error("SyntaxError: Reserved word \"" + (this.value()) + "\" on line " + (this.line + 1) + " can't be assigned");
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};
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// Expand variables and expressions inside double-quoted strings using
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// [ECMA Harmony's interpolation syntax](http://wiki.ecmascript.org/doku.php?id=strawman:string_interpolation)
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// for substitution of bare variables as well as arbitrary expressions.
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// "Hello $name."
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// "Hello ${name.capitalize()}."
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// If it encounters an interpolation, this method will recursively create a
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// new Lexer, tokenize the interpolated contents, and merge them into the
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// token stream.
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Lexer.prototype.interpolate_string = function interpolate_string(str, escape_quotes) {
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var _a, _b, _c, _d, _e, escaped, expr, group, i, inner, interp, lexer, match, nested, pi, quote, tag, token, tokens, value;
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if (str.length < 3 || !starts(str, '"')) {
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return this.token('STRING', str);
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} else {
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lexer = new Lexer();
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tokens = [];
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quote = str.substring(0, 1);
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_a = [1, 1];
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i = _a[0];
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pi = _a[1];
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while (i < str.length - 1) {
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if (starts(str, '\\', i)) {
|
|
i += 1;
|
|
} else if ((match = str.substring(i).match(INTERPOLATION))) {
|
|
_b = match;
|
|
group = _b[0];
|
|
interp = _b[1];
|
|
if (starts(interp, '@')) {
|
|
interp = "this." + (interp.substring(1));
|
|
}
|
|
if (pi < i) {
|
|
tokens.push(['STRING', '' + quote + (str.substring(pi, i)) + quote]);
|
|
}
|
|
tokens.push(['IDENTIFIER', interp]);
|
|
i += group.length - 1;
|
|
pi = i + 1;
|
|
} else if (((expr = balanced_string(str.substring(i), [['${', '}']])))) {
|
|
if (pi < i) {
|
|
tokens.push(['STRING', '' + quote + (str.substring(pi, i)) + quote]);
|
|
}
|
|
inner = expr.substring(2, expr.length - 1);
|
|
if (inner.length) {
|
|
nested = lexer.tokenize("(" + inner + ")", {
|
|
rewrite: false,
|
|
line: this.line
|
|
});
|
|
nested.pop();
|
|
tokens.push(['TOKENS', nested]);
|
|
} else {
|
|
tokens.push(['STRING', '' + quote + quote]);
|
|
}
|
|
i += expr.length - 1;
|
|
pi = i + 1;
|
|
}
|
|
i += 1;
|
|
}
|
|
if (pi < i && pi < str.length - 1) {
|
|
tokens.push(['STRING', '' + quote + (str.substring(pi, i)) + quote]);
|
|
}
|
|
if (!(tokens[0][0] === 'STRING')) {
|
|
tokens.unshift(['STRING', "''"]);
|
|
}
|
|
_c = tokens;
|
|
for (i = 0, _d = _c.length; i < _d; i++) {
|
|
token = _c[i];
|
|
_e = token;
|
|
tag = _e[0];
|
|
value = _e[1];
|
|
if (tag === 'TOKENS') {
|
|
this.tokens = this.tokens.concat(value);
|
|
} else if (tag === 'STRING' && escape_quotes) {
|
|
escaped = value.substring(1, value.length - 1).replace(/"/g, '\\"');
|
|
this.token(tag, "\"" + escaped + "\"");
|
|
} else {
|
|
this.token(tag, value);
|
|
}
|
|
if (i < tokens.length - 1) {
|
|
this.token('+', '+');
|
|
}
|
|
}
|
|
return tokens;
|
|
}
|
|
};
|
|
// Helpers
|
|
// -------
|
|
// Add a token to the results, taking note of the line number.
|
|
Lexer.prototype.token = function token(tag, value) {
|
|
return this.tokens.push([tag, value, this.line]);
|
|
};
|
|
// Peek at a tag in the current token stream.
|
|
Lexer.prototype.tag = function tag(index, tag) {
|
|
var tok;
|
|
if (!((tok = this.prev(index)))) {
|
|
return null;
|
|
}
|
|
if ((typeof tag !== "undefined" && tag !== null)) {
|
|
return (tok[0] = tag);
|
|
}
|
|
return tok[0];
|
|
};
|
|
// Peek at a value in the current token stream.
|
|
Lexer.prototype.value = function value(index, val) {
|
|
var tok;
|
|
if (!((tok = this.prev(index)))) {
|
|
return null;
|
|
}
|
|
if ((typeof val !== "undefined" && val !== null)) {
|
|
return (tok[1] = val);
|
|
}
|
|
return tok[1];
|
|
};
|
|
// Peek at a previous token, entire.
|
|
Lexer.prototype.prev = function prev(index) {
|
|
return this.tokens[this.tokens.length - (index || 1)];
|
|
};
|
|
// Attempt to match a string against the current chunk, returning the indexed
|
|
// match if successful, and `false` otherwise.
|
|
Lexer.prototype.match = function match(regex, index) {
|
|
var m;
|
|
if (!((m = this.chunk.match(regex)))) {
|
|
return false;
|
|
}
|
|
return m ? m[index] : false;
|
|
};
|
|
return Lexer;
|
|
}).call(this);
|
|
// There are no exensions to the core lexer by default.
|
|
Lexer.extensions = [];
|
|
// Constants
|
|
// ---------
|
|
// Keywords that CoffeeScript shares in common with JavaScript.
|
|
JS_KEYWORDS = ["if", "else", "true", "false", "new", "return", "try", "catch", "finally", "throw", "break", "continue", "for", "in", "while", "delete", "instanceof", "typeof", "switch", "super", "extends", "class"];
|
|
// CoffeeScript-only keywords, which we're more relaxed about allowing. They can't
|
|
// be used standalone, but you can reference them as an attached property.
|
|
COFFEE_KEYWORDS = ["then", "unless", "yes", "no", "on", "off", "and", "or", "is", "isnt", "not", "of", "by", "where", "when"];
|
|
// The combined list of keywords is the superset that gets passed verbatim to
|
|
// the parser.
|
|
KEYWORDS = JS_KEYWORDS.concat(COFFEE_KEYWORDS);
|
|
// The list of keywords that are reserved by JavaScript, but not used, or are
|
|
// used by CoffeeScript internally. We throw an error when these are encountered,
|
|
// to avoid having a JavaScript error at runtime.
|
|
RESERVED = ["case", "default", "do", "function", "var", "void", "with", "const", "let", "debugger", "enum", "export", "import", "native", "__extends", "__hasProp"];
|
|
// The superset of both JavaScript keywords and reserved words, none of which may
|
|
// be used as identifiers or properties.
|
|
JS_FORBIDDEN = JS_KEYWORDS.concat(RESERVED);
|
|
// Token matching regexes.
|
|
IDENTIFIER = /^([a-zA-Z\$_](\w|\$)*)/;
|
|
NUMBER = /^(\b((0(x|X)[0-9a-fA-F]+)|([0-9]+(\.[0-9]+)?(e[+\-]?[0-9]+)?)))\b/i;
|
|
HEREDOC = /^("{6}|'{6}|"{3}\n?([\s\S]*?)\n?([ \t]*)"{3}|'{3}\n?([\s\S]*?)\n?([ \t]*)'{3})/;
|
|
INTERPOLATION = /^\$([a-zA-Z_@]\w*(\.\w+)*)/;
|
|
OPERATOR = /^([+\*&|\/\-%=<>:!?]+)/;
|
|
WHITESPACE = /^([ \t]+)/;
|
|
COMMENT = /^(((\n?[ \t]*)?#[^\n]*)+)/;
|
|
CODE = /^((-|=)>)/;
|
|
MULTI_DENT = /^((\n([ \t]*))+)(\.)?/;
|
|
LAST_DENTS = /\n([ \t]*)/g;
|
|
LAST_DENT = /\n([ \t]*)/;
|
|
ASSIGNMENT = /^(:|=)$/;
|
|
// Regex-matching-regexes.
|
|
REGEX_START = /^\/[^\/ ]/;
|
|
REGEX_INTERPOLATION = /([^\\]\$[a-zA-Z_@]|[^\\]\$\{.*[^\\]\})/;
|
|
REGEX_FLAGS = /^[imgy]{0,4}/;
|
|
REGEX_ESCAPE = /\\[^\$]/g;
|
|
// Token cleaning regexes.
|
|
JS_CLEANER = /(^`|`$)/g;
|
|
MULTILINER = /\n/g;
|
|
STRING_NEWLINES = /\n[ \t]*/g;
|
|
COMMENT_CLEANER = /(^[ \t]*#|\n[ \t]*$)/mg;
|
|
NO_NEWLINE = /^([+\*&|\/\-%=<>:!.\\][<>=&|]*|and|or|is|isnt|not|delete|typeof|instanceof)$/;
|
|
HEREDOC_INDENT = /^[ \t]+/mg;
|
|
// Tokens which a regular expression will never immediately follow, but which
|
|
// a division operator might.
|
|
// See: http://www.mozilla.org/js/language/js20-2002-04/rationale/syntax.html#regular-expressions
|
|
// Our list is shorter, due to sans-parentheses method calls.
|
|
NOT_REGEX = ['NUMBER', 'REGEX', '++', '--', 'FALSE', 'NULL', 'TRUE'];
|
|
// Tokens which could legitimately be invoked or indexed. A opening
|
|
// parentheses or bracket following these tokens will be recorded as the start
|
|
// of a function invocation or indexing operation.
|
|
CALLABLE = ['IDENTIFIER', 'SUPER', ')', ']', '}', 'STRING', '@'];
|
|
// Tokens that indicate an access -- keywords immediately following will be
|
|
// treated as identifiers.
|
|
ACCESSORS = ['PROPERTY_ACCESS', 'PROTOTYPE_ACCESS', 'SOAK_ACCESS', '@'];
|
|
// Tokens that, when immediately preceding a `WHEN`, indicate that the `WHEN`
|
|
// occurs at the start of a line. We disambiguate these from trailing whens to
|
|
// avoid an ambiguity in the grammar.
|
|
BEFORE_WHEN = ['INDENT', 'OUTDENT', 'TERMINATOR'];
|
|
})();
|