[FEAT] Extract the Handlebars parser (#1713)
Extracts the parser to `@handlebars/parser`, where it can be shared between different implementations. This means that e.g. Glimmer/Ember will be able to iterate on new features without forcing Handlebars to adopt them immediately, and vice versa. All implementors will be able to absorb changes as it makes sense for them.
This commit is contained in:
Chris Garrett
GitHub
@@ -1,34 +0,0 @@
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import parser from './parser';
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import WhitespaceControl from './whitespace-control';
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import * as Helpers from './helpers';
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import { extend } from '../utils';
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export { parser };
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let yy = {};
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extend(yy, Helpers);
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export function parseWithoutProcessing(input, options) {
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// Just return if an already-compiled AST was passed in.
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if (input.type === 'Program') {
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return input;
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}
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parser.yy = yy;
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// Altering the shared object here, but this is ok as parser is a sync operation
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yy.locInfo = function(locInfo) {
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return new yy.SourceLocation(options && options.srcName, locInfo);
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};
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let ast = parser.parse(input);
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return ast;
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}
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export function parse(input, options) {
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let ast = parseWithoutProcessing(input, options);
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let strip = new WhitespaceControl(options);
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return strip.accept(ast);
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}
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@@ -1,6 +1,6 @@
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/* eslint-disable new-cap */
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import Exception from '../exception';
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import { Exception } from '@handlebars/parser';
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import { isArray, indexOf, extend } from '../utils';
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import AST from './ast';
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@@ -1,219 +0,0 @@
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import Exception from '../exception';
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function validateClose(open, close) {
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close = close.path ? close.path.original : close;
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if (open.path.original !== close) {
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let errorNode = { loc: open.path.loc };
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throw new Exception(
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open.path.original + " doesn't match " + close,
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errorNode
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);
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}
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}
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export function SourceLocation(source, locInfo) {
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this.source = source;
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this.start = {
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line: locInfo.first_line,
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column: locInfo.first_column
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};
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this.end = {
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line: locInfo.last_line,
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column: locInfo.last_column
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};
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}
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export function id(token) {
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if (/^\[.*\]$/.test(token)) {
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return token.substring(1, token.length - 1);
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} else {
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return token;
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}
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}
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export function stripFlags(open, close) {
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return {
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open: open.charAt(2) === '~',
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close: close.charAt(close.length - 3) === '~'
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};
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}
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export function stripComment(comment) {
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return comment.replace(/^\{\{~?!-?-?/, '').replace(/-?-?~?\}\}$/, '');
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}
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export function preparePath(data, parts, loc) {
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loc = this.locInfo(loc);
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let original = data ? '@' : '',
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dig = [],
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depth = 0;
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for (let i = 0, l = parts.length; i < l; i++) {
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let part = parts[i].part,
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// If we have [] syntax then we do not treat path references as operators,
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// i.e. foo.[this] resolves to approximately context.foo['this']
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isLiteral = parts[i].original !== part;
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original += (parts[i].separator || '') + part;
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if (!isLiteral && (part === '..' || part === '.' || part === 'this')) {
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if (dig.length > 0) {
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throw new Exception('Invalid path: ' + original, { loc });
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} else if (part === '..') {
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depth++;
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}
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} else {
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dig.push(part);
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}
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}
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return {
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type: 'PathExpression',
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data,
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depth,
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parts: dig,
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original,
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loc
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};
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}
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export function prepareMustache(path, params, hash, open, strip, locInfo) {
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// Must use charAt to support IE pre-10
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let escapeFlag = open.charAt(3) || open.charAt(2),
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escaped = escapeFlag !== '{' && escapeFlag !== '&';
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let decorator = /\*/.test(open);
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return {
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type: decorator ? 'Decorator' : 'MustacheStatement',
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path,
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params,
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hash,
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escaped,
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strip,
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loc: this.locInfo(locInfo)
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};
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}
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export function prepareRawBlock(openRawBlock, contents, close, locInfo) {
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validateClose(openRawBlock, close);
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locInfo = this.locInfo(locInfo);
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let program = {
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type: 'Program',
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body: contents,
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strip: {},
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loc: locInfo
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};
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return {
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type: 'BlockStatement',
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path: openRawBlock.path,
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params: openRawBlock.params,
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hash: openRawBlock.hash,
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program,
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openStrip: {},
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inverseStrip: {},
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closeStrip: {},
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loc: locInfo
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};
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}
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export function prepareBlock(
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openBlock,
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program,
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inverseAndProgram,
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close,
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inverted,
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locInfo
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) {
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if (close && close.path) {
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validateClose(openBlock, close);
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}
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let decorator = /\*/.test(openBlock.open);
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program.blockParams = openBlock.blockParams;
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let inverse, inverseStrip;
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if (inverseAndProgram) {
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if (decorator) {
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throw new Exception(
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'Unexpected inverse block on decorator',
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inverseAndProgram
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);
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}
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if (inverseAndProgram.chain) {
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inverseAndProgram.program.body[0].closeStrip = close.strip;
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}
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inverseStrip = inverseAndProgram.strip;
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inverse = inverseAndProgram.program;
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}
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if (inverted) {
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inverted = inverse;
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inverse = program;
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program = inverted;
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}
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return {
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type: decorator ? 'DecoratorBlock' : 'BlockStatement',
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path: openBlock.path,
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params: openBlock.params,
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hash: openBlock.hash,
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program,
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inverse,
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openStrip: openBlock.strip,
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inverseStrip,
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closeStrip: close && close.strip,
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loc: this.locInfo(locInfo)
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};
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}
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export function prepareProgram(statements, loc) {
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if (!loc && statements.length) {
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const firstLoc = statements[0].loc,
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lastLoc = statements[statements.length - 1].loc;
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/* istanbul ignore else */
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if (firstLoc && lastLoc) {
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loc = {
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source: firstLoc.source,
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start: {
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line: firstLoc.start.line,
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column: firstLoc.start.column
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},
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end: {
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line: lastLoc.end.line,
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column: lastLoc.end.column
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}
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};
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}
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}
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return {
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type: 'Program',
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body: statements,
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strip: {},
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loc: loc
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};
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}
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export function preparePartialBlock(open, program, close, locInfo) {
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validateClose(open, close);
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return {
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type: 'PartialBlockStatement',
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name: open.path,
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params: open.params,
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hash: open.hash,
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program,
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openStrip: open.strip,
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closeStrip: close && close.strip,
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loc: this.locInfo(locInfo)
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};
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}
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@@ -1,5 +1,5 @@
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import { Exception } from '@handlebars/parser';
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import { COMPILER_REVISION, REVISION_CHANGES } from '../base';
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import Exception from '../exception';
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import { isArray } from '../utils';
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import CodeGen from './code-gen';
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@@ -1,178 +0,0 @@
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/* eslint-disable new-cap */
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import Visitor from './visitor';
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export function print(ast) {
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return new PrintVisitor().accept(ast);
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}
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export function PrintVisitor() {
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this.padding = 0;
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}
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PrintVisitor.prototype = new Visitor();
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PrintVisitor.prototype.pad = function(string) {
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let out = '';
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for (let i = 0, l = this.padding; i < l; i++) {
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out += ' ';
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}
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out += string + '\n';
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return out;
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};
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PrintVisitor.prototype.Program = function(program) {
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let out = '',
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body = program.body,
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i,
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l;
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if (program.blockParams) {
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let blockParams = 'BLOCK PARAMS: [';
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for (i = 0, l = program.blockParams.length; i < l; i++) {
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blockParams += ' ' + program.blockParams[i];
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}
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blockParams += ' ]';
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out += this.pad(blockParams);
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}
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for (i = 0, l = body.length; i < l; i++) {
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out += this.accept(body[i]);
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}
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this.padding--;
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return out;
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};
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PrintVisitor.prototype.MustacheStatement = function(mustache) {
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return this.pad('{{ ' + this.SubExpression(mustache) + ' }}');
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};
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PrintVisitor.prototype.Decorator = function(mustache) {
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return this.pad('{{ DIRECTIVE ' + this.SubExpression(mustache) + ' }}');
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};
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PrintVisitor.prototype.BlockStatement = PrintVisitor.prototype.DecoratorBlock = function(
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block
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) {
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let out = '';
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out += this.pad(
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(block.type === 'DecoratorBlock' ? 'DIRECTIVE ' : '') + 'BLOCK:'
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);
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this.padding++;
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out += this.pad(this.SubExpression(block));
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if (block.program) {
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out += this.pad('PROGRAM:');
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this.padding++;
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out += this.accept(block.program);
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this.padding--;
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}
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if (block.inverse) {
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if (block.program) {
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this.padding++;
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}
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out += this.pad('{{^}}');
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this.padding++;
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out += this.accept(block.inverse);
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this.padding--;
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if (block.program) {
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this.padding--;
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}
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}
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this.padding--;
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return out;
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};
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PrintVisitor.prototype.PartialStatement = function(partial) {
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let content = 'PARTIAL:' + partial.name.original;
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if (partial.params[0]) {
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content += ' ' + this.accept(partial.params[0]);
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}
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if (partial.hash) {
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content += ' ' + this.accept(partial.hash);
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}
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return this.pad('{{> ' + content + ' }}');
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};
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PrintVisitor.prototype.PartialBlockStatement = function(partial) {
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let content = 'PARTIAL BLOCK:' + partial.name.original;
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if (partial.params[0]) {
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content += ' ' + this.accept(partial.params[0]);
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}
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if (partial.hash) {
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content += ' ' + this.accept(partial.hash);
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}
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content += ' ' + this.pad('PROGRAM:');
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this.padding++;
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content += this.accept(partial.program);
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this.padding--;
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return this.pad('{{> ' + content + ' }}');
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};
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PrintVisitor.prototype.ContentStatement = function(content) {
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return this.pad("CONTENT[ '" + content.value + "' ]");
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};
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PrintVisitor.prototype.CommentStatement = function(comment) {
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return this.pad("{{! '" + comment.value + "' }}");
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};
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PrintVisitor.prototype.SubExpression = function(sexpr) {
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let params = sexpr.params,
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paramStrings = [],
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hash;
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for (let i = 0, l = params.length; i < l; i++) {
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paramStrings.push(this.accept(params[i]));
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}
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params = '[' + paramStrings.join(', ') + ']';
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hash = sexpr.hash ? ' ' + this.accept(sexpr.hash) : '';
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return this.accept(sexpr.path) + ' ' + params + hash;
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};
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PrintVisitor.prototype.PathExpression = function(id) {
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let path = id.parts.join('/');
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return (id.data ? '@' : '') + 'PATH:' + path;
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};
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PrintVisitor.prototype.StringLiteral = function(string) {
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return '"' + string.value + '"';
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};
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PrintVisitor.prototype.NumberLiteral = function(number) {
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return 'NUMBER{' + number.value + '}';
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};
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PrintVisitor.prototype.BooleanLiteral = function(bool) {
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return 'BOOLEAN{' + bool.value + '}';
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};
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PrintVisitor.prototype.UndefinedLiteral = function() {
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return 'UNDEFINED';
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};
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PrintVisitor.prototype.NullLiteral = function() {
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return 'NULL';
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};
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PrintVisitor.prototype.Hash = function(hash) {
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let pairs = hash.pairs,
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joinedPairs = [];
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for (let i = 0, l = pairs.length; i < l; i++) {
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joinedPairs.push(this.accept(pairs[i]));
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}
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return 'HASH{' + joinedPairs.join(', ') + '}';
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};
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PrintVisitor.prototype.HashPair = function(pair) {
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return pair.key + '=' + this.accept(pair.value);
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};
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/* eslint-enable new-cap */
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@@ -1,136 +0,0 @@
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import Exception from '../exception';
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function Visitor() {
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this.parents = [];
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}
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|
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Visitor.prototype = {
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constructor: Visitor,
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mutating: false,
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|
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// Visits a given value. If mutating, will replace the value if necessary.
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acceptKey: function(node, name) {
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let value = this.accept(node[name]);
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if (this.mutating) {
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// Hacky sanity check: This may have a few false positives for type for the helper
|
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// methods but will generally do the right thing without a lot of overhead.
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if (value && !Visitor.prototype[value.type]) {
|
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throw new Exception(
|
||||
'Unexpected node type "' +
|
||||
value.type +
|
||||
'" found when accepting ' +
|
||||
name +
|
||||
' on ' +
|
||||
node.type
|
||||
);
|
||||
}
|
||||
node[name] = value;
|
||||
}
|
||||
},
|
||||
|
||||
// Performs an accept operation with added sanity check to ensure
|
||||
// required keys are not removed.
|
||||
acceptRequired: function(node, name) {
|
||||
this.acceptKey(node, name);
|
||||
|
||||
if (!node[name]) {
|
||||
throw new Exception(node.type + ' requires ' + name);
|
||||
}
|
||||
},
|
||||
|
||||
// Traverses a given array. If mutating, empty respnses will be removed
|
||||
// for child elements.
|
||||
acceptArray: function(array) {
|
||||
for (let i = 0, l = array.length; i < l; i++) {
|
||||
this.acceptKey(array, i);
|
||||
|
||||
if (!array[i]) {
|
||||
array.splice(i, 1);
|
||||
i--;
|
||||
l--;
|
||||
}
|
||||
}
|
||||
},
|
||||
|
||||
accept: function(object) {
|
||||
if (!object) {
|
||||
return;
|
||||
}
|
||||
|
||||
/* istanbul ignore next: Sanity code */
|
||||
if (!this[object.type]) {
|
||||
throw new Exception('Unknown type: ' + object.type, object);
|
||||
}
|
||||
|
||||
if (this.current) {
|
||||
this.parents.unshift(this.current);
|
||||
}
|
||||
this.current = object;
|
||||
|
||||
let ret = this[object.type](object);
|
||||
|
||||
this.current = this.parents.shift();
|
||||
|
||||
if (!this.mutating || ret) {
|
||||
return ret;
|
||||
} else if (ret !== false) {
|
||||
return object;
|
||||
}
|
||||
},
|
||||
|
||||
Program: function(program) {
|
||||
this.acceptArray(program.body);
|
||||
},
|
||||
|
||||
MustacheStatement: visitSubExpression,
|
||||
Decorator: visitSubExpression,
|
||||
|
||||
BlockStatement: visitBlock,
|
||||
DecoratorBlock: visitBlock,
|
||||
|
||||
PartialStatement: visitPartial,
|
||||
PartialBlockStatement: function(partial) {
|
||||
visitPartial.call(this, partial);
|
||||
|
||||
this.acceptKey(partial, 'program');
|
||||
},
|
||||
|
||||
ContentStatement: function(/* content */) {},
|
||||
CommentStatement: function(/* comment */) {},
|
||||
|
||||
SubExpression: visitSubExpression,
|
||||
|
||||
PathExpression: function(/* path */) {},
|
||||
|
||||
StringLiteral: function(/* string */) {},
|
||||
NumberLiteral: function(/* number */) {},
|
||||
BooleanLiteral: function(/* bool */) {},
|
||||
UndefinedLiteral: function(/* literal */) {},
|
||||
NullLiteral: function(/* literal */) {},
|
||||
|
||||
Hash: function(hash) {
|
||||
this.acceptArray(hash.pairs);
|
||||
},
|
||||
HashPair: function(pair) {
|
||||
this.acceptRequired(pair, 'value');
|
||||
}
|
||||
};
|
||||
|
||||
function visitSubExpression(mustache) {
|
||||
this.acceptRequired(mustache, 'path');
|
||||
this.acceptArray(mustache.params);
|
||||
this.acceptKey(mustache, 'hash');
|
||||
}
|
||||
function visitBlock(block) {
|
||||
visitSubExpression.call(this, block);
|
||||
|
||||
this.acceptKey(block, 'program');
|
||||
this.acceptKey(block, 'inverse');
|
||||
}
|
||||
function visitPartial(partial) {
|
||||
this.acceptRequired(partial, 'name');
|
||||
this.acceptArray(partial.params);
|
||||
this.acceptKey(partial, 'hash');
|
||||
}
|
||||
|
||||
export default Visitor;
|
||||
@@ -1,234 +0,0 @@
|
||||
import Visitor from './visitor';
|
||||
|
||||
function WhitespaceControl(options = {}) {
|
||||
this.options = options;
|
||||
}
|
||||
WhitespaceControl.prototype = new Visitor();
|
||||
|
||||
WhitespaceControl.prototype.Program = function(program) {
|
||||
const doStandalone = !this.options.ignoreStandalone;
|
||||
|
||||
let isRoot = !this.isRootSeen;
|
||||
this.isRootSeen = true;
|
||||
|
||||
let body = program.body;
|
||||
for (let i = 0, l = body.length; i < l; i++) {
|
||||
let current = body[i],
|
||||
strip = this.accept(current);
|
||||
|
||||
if (!strip) {
|
||||
continue;
|
||||
}
|
||||
|
||||
let _isPrevWhitespace = isPrevWhitespace(body, i, isRoot),
|
||||
_isNextWhitespace = isNextWhitespace(body, i, isRoot),
|
||||
openStandalone = strip.openStandalone && _isPrevWhitespace,
|
||||
closeStandalone = strip.closeStandalone && _isNextWhitespace,
|
||||
inlineStandalone =
|
||||
strip.inlineStandalone && _isPrevWhitespace && _isNextWhitespace;
|
||||
|
||||
if (strip.close) {
|
||||
omitRight(body, i, true);
|
||||
}
|
||||
if (strip.open) {
|
||||
omitLeft(body, i, true);
|
||||
}
|
||||
|
||||
if (doStandalone && inlineStandalone) {
|
||||
omitRight(body, i);
|
||||
|
||||
if (omitLeft(body, i)) {
|
||||
// If we are on a standalone node, save the indent info for partials
|
||||
if (current.type === 'PartialStatement') {
|
||||
// Pull out the whitespace from the final line
|
||||
current.indent = /([ \t]+$)/.exec(body[i - 1].original)[1];
|
||||
}
|
||||
}
|
||||
}
|
||||
if (doStandalone && openStandalone) {
|
||||
omitRight((current.program || current.inverse).body);
|
||||
|
||||
// Strip out the previous content node if it's whitespace only
|
||||
omitLeft(body, i);
|
||||
}
|
||||
if (doStandalone && closeStandalone) {
|
||||
// Always strip the next node
|
||||
omitRight(body, i);
|
||||
|
||||
omitLeft((current.inverse || current.program).body);
|
||||
}
|
||||
}
|
||||
|
||||
return program;
|
||||
};
|
||||
|
||||
WhitespaceControl.prototype.BlockStatement = WhitespaceControl.prototype.DecoratorBlock = WhitespaceControl.prototype.PartialBlockStatement = function(
|
||||
block
|
||||
) {
|
||||
this.accept(block.program);
|
||||
this.accept(block.inverse);
|
||||
|
||||
// Find the inverse program that is involed with whitespace stripping.
|
||||
let program = block.program || block.inverse,
|
||||
inverse = block.program && block.inverse,
|
||||
firstInverse = inverse,
|
||||
lastInverse = inverse;
|
||||
|
||||
if (inverse && inverse.chained) {
|
||||
firstInverse = inverse.body[0].program;
|
||||
|
||||
// Walk the inverse chain to find the last inverse that is actually in the chain.
|
||||
while (lastInverse.chained) {
|
||||
lastInverse = lastInverse.body[lastInverse.body.length - 1].program;
|
||||
}
|
||||
}
|
||||
|
||||
let strip = {
|
||||
open: block.openStrip.open,
|
||||
close: block.closeStrip.close,
|
||||
|
||||
// Determine the standalone candiacy. Basically flag our content as being possibly standalone
|
||||
// so our parent can determine if we actually are standalone
|
||||
openStandalone: isNextWhitespace(program.body),
|
||||
closeStandalone: isPrevWhitespace((firstInverse || program).body)
|
||||
};
|
||||
|
||||
if (block.openStrip.close) {
|
||||
omitRight(program.body, null, true);
|
||||
}
|
||||
|
||||
if (inverse) {
|
||||
let inverseStrip = block.inverseStrip;
|
||||
|
||||
if (inverseStrip.open) {
|
||||
omitLeft(program.body, null, true);
|
||||
}
|
||||
|
||||
if (inverseStrip.close) {
|
||||
omitRight(firstInverse.body, null, true);
|
||||
}
|
||||
if (block.closeStrip.open) {
|
||||
omitLeft(lastInverse.body, null, true);
|
||||
}
|
||||
|
||||
// Find standalone else statments
|
||||
if (
|
||||
!this.options.ignoreStandalone &&
|
||||
isPrevWhitespace(program.body) &&
|
||||
isNextWhitespace(firstInverse.body)
|
||||
) {
|
||||
omitLeft(program.body);
|
||||
omitRight(firstInverse.body);
|
||||
}
|
||||
} else if (block.closeStrip.open) {
|
||||
omitLeft(program.body, null, true);
|
||||
}
|
||||
|
||||
return strip;
|
||||
};
|
||||
|
||||
WhitespaceControl.prototype.Decorator = WhitespaceControl.prototype.MustacheStatement = function(
|
||||
mustache
|
||||
) {
|
||||
return mustache.strip;
|
||||
};
|
||||
|
||||
WhitespaceControl.prototype.PartialStatement = WhitespaceControl.prototype.CommentStatement = function(
|
||||
node
|
||||
) {
|
||||
/* istanbul ignore next */
|
||||
let strip = node.strip || {};
|
||||
return {
|
||||
inlineStandalone: true,
|
||||
open: strip.open,
|
||||
close: strip.close
|
||||
};
|
||||
};
|
||||
|
||||
function isPrevWhitespace(body, i, isRoot) {
|
||||
if (i === undefined) {
|
||||
i = body.length;
|
||||
}
|
||||
|
||||
// Nodes that end with newlines are considered whitespace (but are special
|
||||
// cased for strip operations)
|
||||
let prev = body[i - 1],
|
||||
sibling = body[i - 2];
|
||||
if (!prev) {
|
||||
return isRoot;
|
||||
}
|
||||
|
||||
if (prev.type === 'ContentStatement') {
|
||||
return (sibling || !isRoot ? /\r?\n\s*?$/ : /(^|\r?\n)\s*?$/).test(
|
||||
prev.original
|
||||
);
|
||||
}
|
||||
}
|
||||
function isNextWhitespace(body, i, isRoot) {
|
||||
if (i === undefined) {
|
||||
i = -1;
|
||||
}
|
||||
|
||||
let next = body[i + 1],
|
||||
sibling = body[i + 2];
|
||||
if (!next) {
|
||||
return isRoot;
|
||||
}
|
||||
|
||||
if (next.type === 'ContentStatement') {
|
||||
return (sibling || !isRoot ? /^\s*?\r?\n/ : /^\s*?(\r?\n|$)/).test(
|
||||
next.original
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
// Marks the node to the right of the position as omitted.
|
||||
// I.e. {{foo}}' ' will mark the ' ' node as omitted.
|
||||
//
|
||||
// If i is undefined, then the first child will be marked as such.
|
||||
//
|
||||
// If multiple is truthy then all whitespace will be stripped out until non-whitespace
|
||||
// content is met.
|
||||
function omitRight(body, i, multiple) {
|
||||
let current = body[i == null ? 0 : i + 1];
|
||||
if (
|
||||
!current ||
|
||||
current.type !== 'ContentStatement' ||
|
||||
(!multiple && current.rightStripped)
|
||||
) {
|
||||
return;
|
||||
}
|
||||
|
||||
let original = current.value;
|
||||
current.value = current.value.replace(
|
||||
multiple ? /^\s+/ : /^[ \t]*\r?\n?/,
|
||||
''
|
||||
);
|
||||
current.rightStripped = current.value !== original;
|
||||
}
|
||||
|
||||
// Marks the node to the left of the position as omitted.
|
||||
// I.e. ' '{{foo}} will mark the ' ' node as omitted.
|
||||
//
|
||||
// If i is undefined then the last child will be marked as such.
|
||||
//
|
||||
// If multiple is truthy then all whitespace will be stripped out until non-whitespace
|
||||
// content is met.
|
||||
function omitLeft(body, i, multiple) {
|
||||
let current = body[i == null ? body.length - 1 : i - 1];
|
||||
if (
|
||||
!current ||
|
||||
current.type !== 'ContentStatement' ||
|
||||
(!multiple && current.leftStripped)
|
||||
) {
|
||||
return;
|
||||
}
|
||||
|
||||
// We omit the last node if it's whitespace only and not preceded by a non-content node.
|
||||
let original = current.value;
|
||||
current.value = current.value.replace(multiple ? /\s+$/ : /[ \t]+$/, '');
|
||||
current.leftStripped = current.value !== original;
|
||||
return current.leftStripped;
|
||||
}
|
||||
|
||||
export default WhitespaceControl;
|
||||
Reference in New Issue
Block a user