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feat: add plugin to support android/ios styleUrls (#47)
When given an url "./style.css" and the resource "style.css" does not exist in the current directory, the plugin will change the url to "style.android|ios.css". The target platform should be provided in the options of the plugin. Closes #36
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Original file line number | Diff line number | Diff line change |
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const ts = require("typescript"); | ||
const fs = require("fs"); | ||
const path = require("path"); | ||
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const StyleUrlResolvePlugin = (function() { | ||
function StyleUrlResolvePlugin(options) { | ||
if (!options || !options.platform) { | ||
throw new Error(`Target platform must be specified!`); | ||
} | ||
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this.platform = options.platform; | ||
} | ||
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StyleUrlResolvePlugin.prototype.apply = function (compiler) { | ||
compiler.plugin("make", (compilation, callback) => { | ||
const aotPlugin = getAotPlugin(compilation); | ||
aotPlugin._program.getSourceFiles() | ||
.forEach(sf => this.usePlatformStyleUrl(sf)); | ||
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callback(); | ||
}) | ||
}; | ||
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function getAotPlugin(compilation) { | ||
let maybeAotPlugin = compilation._ngToolsWebpackPluginInstance; | ||
if (!maybeAotPlugin) { | ||
throw new Error(`This plugin must be used with the AotPlugin!`); | ||
} | ||
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return maybeAotPlugin; | ||
} | ||
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StyleUrlResolvePlugin.prototype.usePlatformStyleUrl = function(sourceFile) { | ||
this.setCurrentDirectory(sourceFile); | ||
ts.forEachChild(sourceFile, node => this.traverseDecorators(node)); | ||
} | ||
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StyleUrlResolvePlugin.prototype.setCurrentDirectory = function(sourceFile) { | ||
this.currentDirectory = path.resolve(sourceFile.path, ".."); | ||
} | ||
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StyleUrlResolvePlugin.prototype.traverseDecorators = function(node) { | ||
if (node.kind !== ts.SyntaxKind.ClassDeclaration || !node.decorators) { | ||
return; | ||
} | ||
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node.decorators.forEach(decorator => { | ||
this.traverseDecoratorArguments(decorator.expression.arguments); | ||
}); | ||
} | ||
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StyleUrlResolvePlugin.prototype.traverseDecoratorArguments = function(args) { | ||
args.forEach(arg => this.traverseProperties(arg.properties)); | ||
} | ||
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StyleUrlResolvePlugin.prototype.traverseProperties = function(properties) { | ||
properties.filter(isStyleUrls) | ||
.forEach(prop => this.traversePropertyElements(prop)); | ||
} | ||
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function isStyleUrls(property) { | ||
return property.name.text === "styleUrls"; | ||
} | ||
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StyleUrlResolvePlugin.prototype.traversePropertyElements = function(property) { | ||
property.initializer.elements | ||
.filter(el => this.notPlatformUrl(el.text)) | ||
.filter(el => this.noMultiplatformFile(el.text)) | ||
.forEach(el => this.replaceStyleUrlsValue(el)); | ||
} | ||
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StyleUrlResolvePlugin.prototype.notPlatformUrl = function(styleUrl) { | ||
let extensionStartIndex = styleUrl.lastIndexOf("."); | ||
let extension = styleUrl.slice(extensionStartIndex); | ||
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return !styleUrl.endsWith(`.${this.platform}${extension}`); | ||
} | ||
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StyleUrlResolvePlugin.prototype.noMultiplatformFile = function(styleUrl) { | ||
let stylePath = path.resolve(this.currentDirectory, styleUrl); | ||
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return !fs.existsSync(stylePath); | ||
} | ||
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StyleUrlResolvePlugin.prototype.replaceStyleUrlsValue = function(element) { | ||
const extensionStartIndex = element.text.lastIndexOf("."); | ||
const prefix = element.text.slice(0, extensionStartIndex); | ||
const currentExtension = element.text.slice(extensionStartIndex); | ||
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element.text = `${prefix}.${this.platform}${currentExtension}`; | ||
} | ||
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return StyleUrlResolvePlugin; | ||
})(); | ||
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module.exports = StyleUrlResolvePlugin; |
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