293 lines
8.2 KiB
JavaScript
293 lines
8.2 KiB
JavaScript
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"use strict";
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function installCompat() {
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'use strict';
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/* eslint-disable camelcase */
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// This must be called like `nunjucks.installCompat` so that `this`
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// references the nunjucks instance
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var runtime = this.runtime;
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var lib = this.lib;
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// Handle slim case where these 'modules' are excluded from the built source
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var Compiler = this.compiler.Compiler;
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var Parser = this.parser.Parser;
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var nodes = this.nodes;
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var lexer = this.lexer;
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var orig_contextOrFrameLookup = runtime.contextOrFrameLookup;
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var orig_memberLookup = runtime.memberLookup;
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var orig_Compiler_assertType;
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var orig_Parser_parseAggregate;
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if (Compiler) {
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orig_Compiler_assertType = Compiler.prototype.assertType;
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}
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if (Parser) {
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orig_Parser_parseAggregate = Parser.prototype.parseAggregate;
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}
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function uninstall() {
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runtime.contextOrFrameLookup = orig_contextOrFrameLookup;
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runtime.memberLookup = orig_memberLookup;
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if (Compiler) {
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Compiler.prototype.assertType = orig_Compiler_assertType;
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}
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if (Parser) {
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Parser.prototype.parseAggregate = orig_Parser_parseAggregate;
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}
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}
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runtime.contextOrFrameLookup = function contextOrFrameLookup(context, frame, key) {
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var val = orig_contextOrFrameLookup.apply(this, arguments);
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if (val !== undefined) {
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return val;
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}
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switch (key) {
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case 'True':
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return true;
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case 'False':
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return false;
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case 'None':
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return null;
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default:
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return undefined;
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}
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};
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function getTokensState(tokens) {
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return {
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index: tokens.index,
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lineno: tokens.lineno,
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colno: tokens.colno
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};
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}
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if (process.env.BUILD_TYPE !== 'SLIM' && nodes && Compiler && Parser) {
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// i.e., not slim mode
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var Slice = nodes.Node.extend('Slice', {
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fields: ['start', 'stop', 'step'],
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init: function init(lineno, colno, start, stop, step) {
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start = start || new nodes.Literal(lineno, colno, null);
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stop = stop || new nodes.Literal(lineno, colno, null);
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step = step || new nodes.Literal(lineno, colno, 1);
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this.parent(lineno, colno, start, stop, step);
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}
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});
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Compiler.prototype.assertType = function assertType(node) {
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if (node instanceof Slice) {
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return;
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}
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orig_Compiler_assertType.apply(this, arguments);
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};
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Compiler.prototype.compileSlice = function compileSlice(node, frame) {
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this._emit('(');
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this._compileExpression(node.start, frame);
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this._emit('),(');
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this._compileExpression(node.stop, frame);
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this._emit('),(');
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this._compileExpression(node.step, frame);
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this._emit(')');
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};
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Parser.prototype.parseAggregate = function parseAggregate() {
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var _this = this;
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var origState = getTokensState(this.tokens);
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// Set back one accounting for opening bracket/parens
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origState.colno--;
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origState.index--;
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try {
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return orig_Parser_parseAggregate.apply(this);
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} catch (e) {
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var errState = getTokensState(this.tokens);
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var rethrow = function rethrow() {
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lib._assign(_this.tokens, errState);
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return e;
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};
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// Reset to state before original parseAggregate called
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lib._assign(this.tokens, origState);
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this.peeked = false;
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var tok = this.peekToken();
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if (tok.type !== lexer.TOKEN_LEFT_BRACKET) {
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throw rethrow();
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} else {
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this.nextToken();
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}
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var node = new Slice(tok.lineno, tok.colno);
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// If we don't encounter a colon while parsing, this is not a slice,
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// so re-raise the original exception.
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var isSlice = false;
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for (var i = 0; i <= node.fields.length; i++) {
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if (this.skip(lexer.TOKEN_RIGHT_BRACKET)) {
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break;
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}
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if (i === node.fields.length) {
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if (isSlice) {
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this.fail('parseSlice: too many slice components', tok.lineno, tok.colno);
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} else {
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break;
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}
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}
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if (this.skip(lexer.TOKEN_COLON)) {
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isSlice = true;
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} else {
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var field = node.fields[i];
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node[field] = this.parseExpression();
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isSlice = this.skip(lexer.TOKEN_COLON) || isSlice;
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}
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}
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if (!isSlice) {
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throw rethrow();
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}
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return new nodes.Array(tok.lineno, tok.colno, [node]);
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}
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};
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}
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function sliceLookup(obj, start, stop, step) {
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obj = obj || [];
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if (start === null) {
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start = step < 0 ? obj.length - 1 : 0;
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}
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if (stop === null) {
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stop = step < 0 ? -1 : obj.length;
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} else if (stop < 0) {
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stop += obj.length;
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}
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if (start < 0) {
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start += obj.length;
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}
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var results = [];
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for (var i = start;; i += step) {
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if (i < 0 || i > obj.length) {
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break;
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}
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if (step > 0 && i >= stop) {
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break;
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}
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if (step < 0 && i <= stop) {
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break;
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}
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results.push(runtime.memberLookup(obj, i));
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}
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return results;
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}
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function hasOwnProp(obj, key) {
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return Object.prototype.hasOwnProperty.call(obj, key);
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}
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var ARRAY_MEMBERS = {
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pop: function pop(index) {
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if (index === undefined) {
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return this.pop();
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}
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if (index >= this.length || index < 0) {
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throw new Error('KeyError');
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}
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return this.splice(index, 1);
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},
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append: function append(element) {
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return this.push(element);
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},
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remove: function remove(element) {
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for (var i = 0; i < this.length; i++) {
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if (this[i] === element) {
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return this.splice(i, 1);
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}
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}
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throw new Error('ValueError');
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},
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count: function count(element) {
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var count = 0;
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for (var i = 0; i < this.length; i++) {
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if (this[i] === element) {
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count++;
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}
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}
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return count;
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},
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index: function index(element) {
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var i;
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if ((i = this.indexOf(element)) === -1) {
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throw new Error('ValueError');
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}
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return i;
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},
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find: function find(element) {
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return this.indexOf(element);
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},
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insert: function insert(index, elem) {
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return this.splice(index, 0, elem);
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}
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};
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var OBJECT_MEMBERS = {
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items: function items() {
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return lib._entries(this);
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},
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values: function values() {
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return lib._values(this);
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},
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keys: function keys() {
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return lib.keys(this);
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},
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get: function get(key, def) {
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var output = this[key];
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if (output === undefined) {
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output = def;
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}
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return output;
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},
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has_key: function has_key(key) {
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return hasOwnProp(this, key);
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},
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pop: function pop(key, def) {
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var output = this[key];
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if (output === undefined && def !== undefined) {
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output = def;
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} else if (output === undefined) {
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throw new Error('KeyError');
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} else {
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delete this[key];
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}
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return output;
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},
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popitem: function popitem() {
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var keys = lib.keys(this);
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if (!keys.length) {
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throw new Error('KeyError');
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}
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var k = keys[0];
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var val = this[k];
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delete this[k];
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return [k, val];
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},
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setdefault: function setdefault(key, def) {
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if (def === void 0) {
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def = null;
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}
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if (!(key in this)) {
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this[key] = def;
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}
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return this[key];
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},
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update: function update(kwargs) {
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lib._assign(this, kwargs);
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return null; // Always returns None
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}
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};
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OBJECT_MEMBERS.iteritems = OBJECT_MEMBERS.items;
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OBJECT_MEMBERS.itervalues = OBJECT_MEMBERS.values;
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OBJECT_MEMBERS.iterkeys = OBJECT_MEMBERS.keys;
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runtime.memberLookup = function memberLookup(obj, val, autoescape) {
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if (arguments.length === 4) {
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return sliceLookup.apply(this, arguments);
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}
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obj = obj || {};
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// If the object is an object, return any of the methods that Python would
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// otherwise provide.
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if (lib.isArray(obj) && hasOwnProp(ARRAY_MEMBERS, val)) {
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return ARRAY_MEMBERS[val].bind(obj);
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}
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if (lib.isObject(obj) && hasOwnProp(OBJECT_MEMBERS, val)) {
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return OBJECT_MEMBERS[val].bind(obj);
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}
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return orig_memberLookup.apply(this, arguments);
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};
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return uninstall;
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}
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module.exports = installCompat;
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