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11 KiB
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{"version":3,"names":["isCallExpression","isExpressionStatement","isFunction","isIdentifier","isJSXIdentifier","isNewExpression","isPlaceholder","isStatement","isStringLiteral","removePropertiesDeep","traverse","PATTERN","parseAndBuildMetadata","formatter","code","opts","placeholderWhitelist","placeholderPattern","preserveComments","syntacticPlaceholders","ast","parseWithCodeFrame","parser","validate","syntactic","placeholders","placeholderNames","Set","legacy","isLegacyRef","value","undefined","placeholderVisitorHandler","node","ancestors","state","name","Error","test","has","slice","parent","key","length","type","expectedNode","push","resolve","resolveAncestors","isDuplicate","add","i","index","parserOpts","plugins","allowReturnOutsideFunction","allowSuperOutsideMethod","sourceType","parse","err","loc","message","codeFrameColumns","start"],"sources":["../src/parse.ts"],"sourcesContent":["import {\n isCallExpression,\n isExpressionStatement,\n isFunction,\n isIdentifier,\n isJSXIdentifier,\n isNewExpression,\n isPlaceholder,\n isStatement,\n isStringLiteral,\n removePropertiesDeep,\n traverse,\n} from \"@babel/types\";\nimport type * as t from \"@babel/types\";\nimport type { TraversalAncestors, TraversalHandler } from \"@babel/types\";\nimport { parse } from \"@babel/parser\";\nimport { codeFrameColumns } from \"@babel/code-frame\";\nimport type { TemplateOpts, ParserOpts } from \"./options\";\nimport type { Formatter } from \"./formatters\";\n\nexport type Metadata = {\n ast: t.File;\n placeholders: Array<Placeholder>;\n placeholderNames: Set<string>;\n};\n\ntype PlaceholderType = \"string\" | \"param\" | \"statement\" | \"other\";\nexport type Placeholder = {\n name: string;\n resolve: (a: t.File) => { parent: t.Node; key: string; index?: number };\n type: PlaceholderType;\n isDuplicate: boolean;\n};\n\nconst PATTERN = /^[_$A-Z0-9]+$/;\n\nexport default function parseAndBuildMetadata<T>(\n formatter: Formatter<T>,\n code: string,\n opts: TemplateOpts,\n): Metadata {\n const {\n placeholderWhitelist,\n placeholderPattern,\n preserveComments,\n syntacticPlaceholders,\n } = opts;\n\n const ast = parseWithCodeFrame(code, opts.parser, syntacticPlaceholders);\n\n removePropertiesDeep(ast, {\n preserveComments,\n });\n\n formatter.validate(ast);\n\n const syntactic: MetadataState[\"syntactic\"] = {\n placeholders: [],\n placeholderNames: new Set(),\n };\n const legacy: MetadataState[\"legacy\"] = {\n placeholders: [],\n placeholderNames: new Set(),\n };\n const isLegacyRef: MetadataState[\"isLegacyRef\"] = { value: undefined };\n\n traverse(ast, placeholderVisitorHandler as TraversalHandler<any>, {\n syntactic,\n legacy,\n isLegacyRef,\n placeholderWhitelist,\n placeholderPattern,\n syntacticPlaceholders,\n });\n\n return {\n ast,\n ...(isLegacyRef.value ? legacy : syntactic),\n };\n}\n\nfunction placeholderVisitorHandler(\n node: t.Node,\n ancestors: TraversalAncestors,\n state: MetadataState,\n) {\n let name: string;\n\n if (isPlaceholder(node)) {\n if (state.syntacticPlaceholders === false) {\n throw new Error(\n \"%%foo%%-style placeholders can't be used when \" +\n \"'.syntacticPlaceholders' is false.\",\n );\n } else {\n name = node.name.name;\n state.isLegacyRef.value = false;\n }\n } else if (state.isLegacyRef.value === false || state.syntacticPlaceholders) {\n return;\n } else if (isIdentifier(node) || isJSXIdentifier(node)) {\n name = node.name;\n state.isLegacyRef.value = true;\n } else if (isStringLiteral(node)) {\n name = node.value;\n state.isLegacyRef.value = true;\n } else {\n return;\n }\n\n if (\n !state.isLegacyRef.value &&\n (state.placeholderPattern != null || state.placeholderWhitelist != null)\n ) {\n // This check is also in options.js. We need it there to handle the default\n // .syntacticPlaceholders behavior.\n throw new Error(\n \"'.placeholderWhitelist' and '.placeholderPattern' aren't compatible\" +\n \" with '.syntacticPlaceholders: true'\",\n );\n }\n\n if (\n state.isLegacyRef.value &&\n (state.placeholderPattern === false ||\n !(state.placeholderPattern || PATTERN).test(name)) &&\n !state.placeholderWhitelist?.has(name)\n ) {\n return;\n }\n\n // Keep our own copy of the ancestors so we can use it in .resolve().\n ancestors = ancestors.slice();\n\n const { node: parent, key } = ancestors[ancestors.length - 1];\n\n let type: PlaceholderType;\n if (\n isStringLiteral(node) ||\n isPlaceholder(node, { expectedNode: \"StringLiteral\" })\n ) {\n type = \"string\";\n } else if (\n (isNewExpression(parent) && key === \"arguments\") ||\n (isCallExpression(parent) && key === \"arguments\") ||\n (isFunction(parent) && key === \"params\")\n ) {\n type = \"param\";\n } else if (isExpressionStatement(parent) && !isPlaceholder(node)) {\n type = \"statement\";\n ancestors = ancestors.slice(0, -1);\n } else if (isStatement(node) && isPlaceholder(node)) {\n type = \"statement\";\n } else {\n type = \"other\";\n }\n\n const { placeholders, placeholderNames } = state.isLegacyRef.value\n ? state.legacy\n : state.syntactic;\n\n placeholders.push({\n name,\n type,\n resolve: ast => resolveAncestors(ast, ancestors),\n isDuplicate: placeholderNames.has(name),\n });\n placeholderNames.add(name);\n}\n\nfunction resolveAncestors(ast: t.File, ancestors: TraversalAncestors) {\n let parent: t.Node = ast;\n for (let i = 0; i < ancestors.length - 1; i++) {\n const { key, index } = ancestors[i];\n\n if (index === undefined) {\n parent = (parent as any)[key];\n } else {\n parent = (parent as any)[key][index];\n }\n }\n\n const { key, index } = ancestors[ancestors.length - 1];\n\n return { parent, key, index };\n}\n\ntype MetadataState = {\n syntactic: {\n placeholders: Array<Placeholder>;\n placeholderNames: Set<string>;\n };\n legacy: {\n placeholders: Array<Placeholder>;\n placeholderNames: Set<string>;\n };\n isLegacyRef: {\n value?: boolean;\n };\n placeholderWhitelist?: Set<string>;\n placeholderPattern?: RegExp | false;\n syntacticPlaceholders?: boolean;\n};\n\nfunction parseWithCodeFrame(\n code: string,\n parserOpts: ParserOpts,\n syntacticPlaceholders?: boolean,\n): t.File {\n const plugins = (parserOpts.plugins || []).slice();\n if (syntacticPlaceholders !== false) {\n plugins.push(\"placeholders\");\n }\n\n parserOpts = {\n allowReturnOutsideFunction: true,\n allowSuperOutsideMethod: true,\n sourceType: \"module\",\n ...parserOpts,\n plugins,\n };\n\n try {\n // @ts-expect-error todo: use babel-types ast typings in Babel parser\n return parse(code, parserOpts);\n } catch (err) {\n const loc = err.loc;\n if (loc) {\n err.message += \"\\n\" + codeFrameColumns(code, { start: loc });\n err.code = \"BABEL_TEMPLATE_PARSE_ERROR\";\n }\n throw err;\n 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