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116 changes: 116 additions & 0 deletions
116
packages/webpack-plugin/lib/style-compiler/strip-conditional-loader.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| const MagicString = require('magic-string') | ||
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| function cssConditionalStrip(cssContent, defs) { | ||
| const ms = new MagicString(cssContent) | ||
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| // 正则匹配 @mpx-if, @mpx-elif, @mpx-else, @mpx-endif 的模式 | ||
| const ifPattern = /\/\*\s*@mpx-if\s*\((.*?)\)\s*\*\//gs | ||
| const elifPattern = /\/\*\s*@mpx-elif\s*\((.*?)\)\s*\*\//gs | ||
| const elsePattern = /\/\*\s*@mpx-else\s*\*\//gs | ||
| const endifPattern = /\/\*\s*@mpx-endif\s*\*\//gs | ||
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| function evaluateCondition(condition) { | ||
| // 替换变量 | ||
| for (const key in defs) { | ||
| condition = condition.replace(new RegExp(`\\b${key}\\b`, 'g'), JSON.stringify(defs[key])) | ||
| } | ||
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| // 解析条件表达式 | ||
| try { | ||
| return Function('"use strict";return (' + condition + ')')() | ||
| } catch (e) { | ||
| throw new Error(`Failed to evaluate condition: ${condition}`) | ||
| } | ||
| } | ||
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| let currentStart = 0 | ||
| function processCondition(start, end, condition) { | ||
| const conditionResult = evaluateCondition(condition) | ||
| let hasElse = false | ||
| let elseStart = -1 | ||
| let elseLen = 0 | ||
| currentStart = end + 1 | ||
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| while (currentStart < ms.original.length) { | ||
| elsePattern.lastIndex = currentStart | ||
| const elseMatch = elsePattern.exec(ms.original) | ||
| if (elseMatch) { | ||
| elseLen = elseMatch[0].length | ||
| } | ||
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| ifPattern.lastIndex = currentStart | ||
| const ifMatch = ifPattern.exec(ms.original) | ||
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| elifPattern.lastIndex = currentStart | ||
| const elifMatch = elifPattern.exec(ms.original) | ||
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| endifPattern.lastIndex = currentStart | ||
| const endifMatch = endifPattern.exec(ms.original) | ||
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| const nextIf = ifMatch ? ifMatch.index : Infinity | ||
| const nextElseIf = elifMatch ? elifMatch.index : Infinity | ||
| const nextElse = elseMatch ? elseMatch.index : Infinity | ||
| const nextEndif = endifMatch ? endifMatch.index : Infinity | ||
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| const nextMarker = Math.min(nextIf, nextElseIf, nextElse, nextEndif) | ||
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| if (nextMarker === Infinity) break | ||
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| if (nextMarker === nextElse) { | ||
| // 处理 @mpx-else | ||
| hasElse = true | ||
| elseStart = nextElse | ||
| currentStart = elseMatch.index + elseLen | ||
| } else if (nextMarker === nextElseIf) { | ||
| // 处理 @mpx-elif | ||
| if (!conditionResult) { | ||
| ms.remove(start, nextElseIf) | ||
| } | ||
| if (elifMatch) { | ||
| currentStart = nextElseIf + elifMatch[0].length | ||
| processCondition(nextElseIf, nextElseIf + elifMatch[0].length, elifMatch[1]) | ||
| } | ||
| } else if (nextMarker === nextIf) { | ||
| // 处理嵌套的 @mpx-if | ||
| // 如果遇到了新的 @mpx-if，则递归处理 | ||
| if (ifMatch) { | ||
| currentStart = nextIf + ifMatch[0].length | ||
| processCondition(nextIf, nextIf + ifMatch[0].length, ifMatch[1]) | ||
| } | ||
| } else if (nextMarker === nextEndif) { | ||
| // 处理 @mpx-endif block块 | ||
| if (conditionResult && hasElse) { | ||
| // 移除 @mpx-else 至 @mpx-endif 代码 | ||
| ms.remove(elseStart, endifMatch.index + endifMatch[0].length) | ||
| } else if (!conditionResult && hasElse) { | ||
| ms.remove(start, elseStart + elseLen) | ||
| } else if (!conditionResult) { | ||
| ms.remove(start, endifMatch.index + endifMatch[0].length) | ||
| } | ||
| currentStart = endifMatch.index + endifMatch[0].length | ||
| break | ||
| } | ||
| // 兜底更新当前开始位置 | ||
| if (currentStart < nextMarker) { | ||
| currentStart = nextMarker + 1 | ||
| } | ||
| } | ||
| } | ||
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| // 处理所有条件 | ||
| let match | ||
| while ((match = ifPattern.exec(ms.original)) !== null) { | ||
| processCondition(match.index, ifPattern.lastIndex, match[1]) | ||
| ifPattern.lastIndex = currentStart | ||
| } | ||
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| return ms.toString() | ||
| } | ||
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| module.exports = function (css) { | ||
| this.cacheable() | ||
| const mpx = this.getMpx() | ||
| const defs = mpx.defs | ||
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| return cssConditionalStrip(css, defs) | ||
| } |