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Side by Side Diff: lib/src/emitters.dart

Issue 13592003: add support for template repeat (Closed) Base URL: https://github.com/dart-lang/web-ui.git@master
Patch Set: feedback Created 7 years, 8 months ago
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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 /** Collects several code emitters for the template tool. */ 5 /** Collects several code emitters for the template tool. */
6 library emitters; 6 library emitters;
7 7
8 import 'dart:uri'; 8 import 'dart:uri';
9 import 'package:csslib/parser.dart' as css; 9 import 'package:csslib/parser.dart' as css;
10 import 'package:csslib/visitor.dart'; 10 import 'package:csslib/visitor.dart';
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83 83
84 var path = _computeNodePath(info.node, parent.node); 84 var path = _computeNodePath(info.node, parent.node);
85 var pathExpr = path.map((p) => '.nodes[$p]').join(); 85 var pathExpr = path.map((p) => '.nodes[$p]').join();
86 86
87 printer.addLine("$id = ${parent.identifier}$pathExpr;", 87 printer.addLine("$id = ${parent.identifier}$pathExpr;",
88 span: info.node.sourceSpan); 88 span: info.node.sourceSpan);
89 } 89 }
90 90
91 printer.add(childrenPrinter); 91 printer.add(childrenPrinter);
92 92
93 if (info.childrenCreatedInCode && !info.hasIterate && !info.hasIfCondition) { 93 if (info.childrenCreatedInCode && !info.hasLoop && !info.hasCondition) {
94 _emitAddNodes(printer, context.statics, info.children, '$id.nodes'); 94 _emitAddNodes(printer, context.statics, info.children, '$id.nodes');
95 } 95 }
96 } 96 }
97 97
98 /** 98 /**
99 * Returns the path of the node from the provided root element. For example, 99 * Returns the path of the node from the provided root element. For example,
100 * given a tree like: 100 * given a tree like:
101 * 101 *
102 * <a><b></b><c><d></d></c></a> 102 * <a><b></b><c><d></d></c></a>
103 * 103 *
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327 ..indent += 1 327 ..indent += 1
328 ..add(childContext.declarations) 328 ..add(childContext.declarations)
329 ..add(childContext.printer) 329 ..add(childContext.printer)
330 ..indent -= 1; 330 ..indent -= 1;
331 _emitAddNodes(printer, childContext.statics, info.children, '__t'); 331 _emitAddNodes(printer, childContext.statics, info.children, '__t');
332 printer..addLine('});\n'); 332 printer..addLine('});\n');
333 } 333 }
334 334
335 /** 335 /**
336 * Emits code for template lists like `<template iterate='item in items'>` or 336 * Emits code for template lists like `<template iterate='item in items'>` or
337 * `<td template iterate='item in items'>`. 337 * `<td template repeat='item in items'>`.
338 */ 338 */
339 void emitLoop(TemplateInfo info, CodePrinter printer, Context childContext) { 339 void emitLoop(TemplateInfo info, CodePrinter printer, Context childContext) {
340 var id = info.identifier; 340 var id = info.identifier;
341 var items = info.loopItems; 341 var items = info.loopItems;
342 var loopVar = info.loopVariable; 342 var loopVar = info.loopVariable;
343 printer..addLine('__t.loop($id, () => $items, ($loopVar, __t) {', 343
344 var suffix = '';
345 // TODO(jmesserly): remove this functionality after a grace period.
346 if (!info.isTemplateElement && !info.isRepeat) suffix = 'IterateAttr';
347
348 printer..addLine('__t.loop$suffix($id, () => $items, ($loopVar, __t) {',
344 span: info.node.sourceSpan) 349 span: info.node.sourceSpan)
345 ..indent += 1 350 ..indent += 1
346 ..add(childContext.declarations) 351 ..add(childContext.declarations)
347 ..add(childContext.printer) 352 ..add(childContext.printer)
348 ..indent -= 1; 353 ..indent -= 1;
349 _emitAddNodes(printer, childContext.statics, info.children, '__t'); 354 _emitAddNodes(printer, childContext.statics, info.children, '__t');
350 printer..addLine(info.isTemplateElement 355 printer.addLine('});');
351 ? '});' : '}, isTemplateElement: false);');
352 } 356 }
353 357
354 358
355 /** 359 /**
356 * An visitor that applies [NodeFieldEmitter], [EventListenerEmitter], 360 * An visitor that applies [NodeFieldEmitter], [EventListenerEmitter],
357 * [DataValueEmitter], [ConditionalEmitter], and 361 * [DataValueEmitter], [ConditionalEmitter], and
358 * [ListEmitter] recursively on a DOM tree. 362 * [ListEmitter] recursively on a DOM tree.
359 */ 363 */
360 class RecursiveEmitter extends InfoVisitor { 364 class RecursiveEmitter extends InfoVisitor {
361 final FileInfo _fileInfo; 365 final FileInfo _fileInfo;
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376 380
377 var indent = _context.printer.indent; 381 var indent = _context.printer.indent;
378 var childPrinter = new CodePrinter(indent); 382 var childPrinter = new CodePrinter(indent);
379 emitDeclarations(info, _context.declarations); 383 emitDeclarations(info, _context.declarations);
380 emitInitializations(info, _context, childPrinter); 384 emitInitializations(info, _context, childPrinter);
381 emitEventListeners(info, _context.printer); 385 emitEventListeners(info, _context.printer);
382 emitAttributeBindings(info, _context.printer); 386 emitAttributeBindings(info, _context.printer);
383 emitComponentCreation(info, _context.printer); 387 emitComponentCreation(info, _context.printer);
384 388
385 var childContext = null; 389 var childContext = null;
386 if (info.hasIfCondition) { 390 if (info.hasCondition) {
387 childContext = new Context(statics: _context.statics, indent: indent + 1); 391 childContext = new Context(statics: _context.statics, indent: indent + 1);
388 emitConditional(info, _context.printer, childContext); 392 emitConditional(info, _context.printer, childContext);
389 } else if (info.hasIterate) { 393 } else if (info.hasLoop) {
390 childContext = new Context(statics: _context.statics, indent: indent + 1); 394 childContext = new Context(statics: _context.statics, indent: indent + 1);
391 emitLoop(info, _context.printer, childContext); 395 emitLoop(info, _context.printer, childContext);
392 } else { 396 } else {
393 childContext = new Context(declarations: _context.declarations, 397 childContext = new Context(declarations: _context.declarations,
394 statics: _context.statics, printer: childPrinter, 398 statics: _context.statics, printer: childPrinter,
395 isClass: _context.isClass); 399 isClass: _context.isClass);
396 } 400 }
397 401
398 // Invoke super to visit children. 402 // Invoke super to visit children.
399 var oldContext = _context; 403 var oldContext = _context;
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793 // For simplicity we emit the warning always, like validator.nu does. 797 // For simplicity we emit the warning always, like validator.nu does.
794 if (doctype.tagName != 'html' || commentIndex != 1) { 798 if (doctype.tagName != 'html' || commentIndex != 1) {
795 messages.warning('file should start with <!DOCTYPE html> ' 799 messages.warning('file should start with <!DOCTYPE html> '
796 'to avoid the possibility of it being parsed in quirks mode in IE. ' 800 'to avoid the possibility of it being parsed in quirks mode in IE. '
797 'See http://www.w3.org/TR/html5-diff/#doctype', doctype.sourceSpan); 801 'See http://www.w3.org/TR/html5-diff/#doctype', doctype.sourceSpan);
798 } 802 }
799 } 803 }
800 document.nodes.insert(commentIndex, parseFragment( 804 document.nodes.insert(commentIndex, parseFragment(
801 '\n<!-- This file was auto-generated from $filePath. -->\n')); 805 '\n<!-- This file was auto-generated from $filePath. -->\n'));
802 } 806 }
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