angular2
Version:
Angular 2 - a web framework for modern web apps
85 lines • 13.1 kB
JavaScript
import { HtmlElementAst, HtmlAttrAst, htmlVisitAll } from 'angular2/src/compiler/html_ast';
import { BaseException } from 'angular2/src/facade/exceptions';
/**
* Expands special forms into elements.
*
* For example,
*
* ```
* { messages.length, plural,
* =0 {zero}
* =1 {one}
* =other {more than one}
* }
* ```
*
* will be expanded into
*
* ```
* <ul [ngPlural]="messages.length">
* <template [ngPluralCase]="0"><li i18n="plural_0">zero</li></template>
* <template [ngPluralCase]="1"><li i18n="plural_1">one</li></template>
* <template [ngPluralCase]="other"><li i18n="plural_other">more than one</li></template>
* </ul>
* ```
*/
export function expandNodes(nodes) {
let e = new _Expander();
let n = htmlVisitAll(e, nodes);
return new ExpansionResult(n, e.expanded);
}
export class ExpansionResult {
constructor(nodes, expanded) {
this.nodes = nodes;
this.expanded = expanded;
}
}
class _Expander {
constructor() {
this.expanded = false;
}
visitElement(ast, context) {
return new HtmlElementAst(ast.name, ast.attrs, htmlVisitAll(this, ast.children), ast.sourceSpan, ast.startSourceSpan, ast.endSourceSpan);
}
visitAttr(ast, context) { return ast; }
visitText(ast, context) { return ast; }
visitComment(ast, context) { return ast; }
visitExpansion(ast, context) {
this.expanded = true;
return ast.type == "plural" ? _expandPluralForm(ast) : _expandDefaultForm(ast);
}
visitExpansionCase(ast, context) {
throw new BaseException("Should not be reached");
}
}
function _expandPluralForm(ast) {
let children = ast.cases.map(c => {
let expansionResult = expandNodes(c.expression);
let i18nAttrs = expansionResult.expanded ?
[] :
[new HtmlAttrAst("i18n", `${ast.type}_${c.value}`, c.valueSourceSpan)];
return new HtmlElementAst(`template`, [
new HtmlAttrAst("ngPluralCase", c.value, c.valueSourceSpan),
], [
new HtmlElementAst(`li`, i18nAttrs, expansionResult.nodes, c.sourceSpan, c.sourceSpan, c.sourceSpan)
], c.sourceSpan, c.sourceSpan, c.sourceSpan);
});
let switchAttr = new HtmlAttrAst("[ngPlural]", ast.switchValue, ast.switchValueSourceSpan);
return new HtmlElementAst("ul", [switchAttr], children, ast.sourceSpan, ast.sourceSpan, ast.sourceSpan);
}
function _expandDefaultForm(ast) {
let children = ast.cases.map(c => {
let expansionResult = expandNodes(c.expression);
let i18nAttrs = expansionResult.expanded ?
[] :
[new HtmlAttrAst("i18n", `${ast.type}_${c.value}`, c.valueSourceSpan)];
return new HtmlElementAst(`template`, [
new HtmlAttrAst("ngSwitchWhen", c.value, c.valueSourceSpan),
], [
new HtmlElementAst(`li`, i18nAttrs, expansionResult.nodes, c.sourceSpan, c.sourceSpan, c.sourceSpan)
], c.sourceSpan, c.sourceSpan, c.sourceSpan);
});
let switchAttr = new HtmlAttrAst("[ngSwitch]", ast.switchValue, ast.switchValueSourceSpan);
return new HtmlElementAst("ul", [switchAttr], children, ast.sourceSpan, ast.sourceSpan, ast.sourceSpan);
}
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_expandPluralForm(ast) : _expandDefaultForm(ast);\n  }\n\n  visitExpansionCase(ast: HtmlExpansionCaseAst, context: any): any {\n    throw new BaseException(\"Should not be reached\");\n  }\n}\n\nfunction _expandPluralForm(ast: HtmlExpansionAst): HtmlElementAst {\n  let children = ast.cases.map(c => {\n    let expansionResult = expandNodes(c.expression);\n    let i18nAttrs = expansionResult.expanded ?\n                        [] :\n                        [new HtmlAttrAst(\"i18n\", `${ast.type}_${c.value}`, c.valueSourceSpan)];\n\n    return new HtmlElementAst(`template`,\n                              [\n                                new HtmlAttrAst(\"ngPluralCase\", c.value, c.valueSourceSpan),\n                              ],\n                              [\n                                new HtmlElementAst(`li`, i18nAttrs, expansionResult.nodes,\n                                                   c.sourceSpan, c.sourceSpan, c.sourceSpan)\n                              ],\n                              c.sourceSpan, c.sourceSpan, c.sourceSpan);\n  });\n  let switchAttr = new HtmlAttrAst(\"[ngPlural]\", ast.switchValue, ast.switchValueSourceSpan);\n  return new HtmlElementAst(\"ul\", [switchAttr], children, ast.sourceSpan, ast.sourceSpan,\n                            ast.sourceSpan);\n}\n\nfunction _expandDefaultForm(ast: HtmlExpansionAst): HtmlElementAst {\n  let children = ast.cases.map(c => {\n    let expansionResult = expandNodes(c.expression);\n    let i18nAttrs = expansionResult.expanded ?\n                        [] :\n                        [new HtmlAttrAst(\"i18n\", `${ast.type}_${c.value}`, c.valueSourceSpan)];\n\n    return new HtmlElementAst(`template`,\n                              [\n                                new HtmlAttrAst(\"ngSwitchWhen\", c.value, c.valueSourceSpan),\n                              ],\n                              [\n                                new HtmlElementAst(`li`, i18nAttrs, expansionResult.nodes,\n                                                   c.sourceSpan, c.sourceSpan, c.sourceSpan)\n                              ],\n                              c.sourceSpan, c.sourceSpan, c.sourceSpan);\n  });\n  let switchAttr = new HtmlAttrAst(\"[ngSwitch]\", ast.switchValue, ast.switchValueSourceSpan);\n  return new HtmlElementAst(\"ul\", [switchAttr], children, ast.sourceSpan, ast.sourceSpan,\n                            ast.sourceSpan);\n}"]}