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Generate an AST from a string template.
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{"version":3,"names":["_t","require","blockStatement","cloneNode","emptyStatement","expressionStatement","identifier","isStatement","isStringLiteral","stringLiteral","validate","populatePlaceholders","metadata","replacements","ast","placeholders","forEach","placeholder","hasOwnProperty","call","name","placeholderName","Error","Object","keys","key","placeholderNames","has","slice","reverse","applyReplacement","e","message","replacement","isDuplicate","Array","isArray","map","node","parent","index","resolve","type","undefined","set","value","typeAnnotation","optional","decorators","items","splice"],"sources":["../src/populate.ts"],"sourcesContent":["import {\n blockStatement,\n cloneNode,\n emptyStatement,\n expressionStatement,\n identifier,\n isStatement,\n isStringLiteral,\n stringLiteral,\n validate,\n} from \"@babel/types\";\nimport type * as t from \"@babel/types\";\n\nimport type { TemplateReplacements } from \"./options.ts\";\nimport type { Metadata, Placeholder } from \"./parse.ts\";\n\nexport default function populatePlaceholders(\n metadata: Metadata,\n replacements: TemplateReplacements,\n): t.File {\n const ast = cloneNode(metadata.ast);\n\n if (replacements) {\n metadata.placeholders.forEach(placeholder => {\n if (!Object.hasOwn(replacements, placeholder.name)) {\n const placeholderName = placeholder.name;\n\n throw new Error(\n `Error: No substitution given for \"${placeholderName}\". If this is not meant to be a\n placeholder you may want to consider passing one of the following options to @babel/template:\n - { placeholderPattern: false, placeholderWhitelist: new Set(['${placeholderName}'])}\n - { placeholderPattern: /^${placeholderName}$/ }`,\n );\n }\n });\n Object.keys(replacements).forEach(key => {\n if (!metadata.placeholderNames.has(key)) {\n throw new Error(`Unknown substitution \"${key}\" given`);\n }\n });\n }\n\n // Process in reverse order so AST mutation doesn't change indices that\n // will be needed for later calls to `placeholder.resolve()`.\n metadata.placeholders\n .slice()\n .reverse()\n .forEach(placeholder => {\n try {\n applyReplacement(\n placeholder,\n ast,\n (replacements && replacements[placeholder.name]) || null,\n );\n } catch (e) {\n e.message = `@babel/template placeholder \"${placeholder.name}\": ${e.message}`;\n throw e;\n }\n });\n\n return ast;\n}\n\nfunction applyReplacement(\n placeholder: Placeholder,\n ast: t.File,\n replacement: any,\n) {\n // Track inserted nodes and clone them if they are inserted more than\n // once to avoid injecting the same node multiple times.\n if (placeholder.isDuplicate) {\n if (Array.isArray(replacement)) {\n replacement = replacement.map(node => cloneNode(node));\n } else if (typeof replacement === \"object\") {\n replacement = cloneNode(replacement);\n }\n }\n\n const { parent, key, index } = placeholder.resolve(ast);\n\n if (placeholder.type === \"string\") {\n if (typeof replacement === \"string\") {\n replacement = stringLiteral(replacement);\n }\n if (!replacement || !isStringLiteral(replacement)) {\n throw new Error(\"Expected string substitution\");\n }\n } else if (placeholder.type === \"statement\") {\n if (index === undefined) {\n if (!replacement) {\n replacement = emptyStatement();\n } else if (Array.isArray(replacement)) {\n replacement = blockStatement(replacement);\n } else if (typeof replacement === \"string\") {\n replacement = expressionStatement(identifier(replacement));\n } else if (!isStatement(replacement)) {\n replacement = expressionStatement(replacement);\n }\n } else {\n if (replacement && !Array.isArray(replacement)) {\n if (typeof replacement === \"string\") {\n replacement = identifier(replacement);\n }\n if (!isStatement(replacement)) {\n replacement = expressionStatement(replacement);\n }\n }\n }\n } else if (placeholder.type === \"param\") {\n if (typeof replacement === \"string\") {\n replacement = identifier(replacement);\n }\n\n if (index === undefined) throw new Error(\"Assertion failure.\");\n } else {\n if (typeof replacement === \"string\") {\n replacement = identifier(replacement);\n }\n if (Array.isArray(replacement)) {\n throw new Error(\"Cannot replace single expression with an array.\");\n }\n }\n\n function set(parent: any, key: any, value: any) {\n const node = parent[key] as t.Node;\n parent[key] = value;\n if (node.type === \"Identifier\" || node.type === \"Placeholder\") {\n if (node.typeAnnotation) {\n value.typeAnnotation = node.typeAnnotation;\n }\n if (node.optional) {\n value.optional = node.optional;\n }\n if (node.decorators) {\n value.decorators = node.decorators;\n }\n }\n }\n\n if (index === undefined) {\n validate(parent, key, replacement);\n\n set(parent, key, replacement);\n } else {\n const items: Array = (parent as any)[key].slice();\n\n if (placeholder.type === \"statement\" || placeholder.type === \"param\") {\n if (replacement == null) {\n items.splice(index, 1);\n } else if (Array.isArray(replacement)) {\n items.splice(index, 1, ...replacement);\n } else {\n set(items, index, replacement);\n }\n } else {\n set(items, index, replacement);\n }\n\n validate(parent, key, items);\n (parent as any)[key] = items;\n 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