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Diffstat (limited to 'node_modules/@babel/template/lib/populate.js')
-rw-r--r-- | node_modules/@babel/template/lib/populate.js | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/node_modules/@babel/template/lib/populate.js b/node_modules/@babel/template/lib/populate.js new file mode 100644 index 0000000..b912556 --- /dev/null +++ b/node_modules/@babel/template/lib/populate.js @@ -0,0 +1,135 @@ +"use strict"; + +Object.defineProperty(exports, "__esModule", { + value: true +}); +exports.default = populatePlaceholders; + +var _t = require("@babel/types"); + +const { + blockStatement, + cloneNode, + emptyStatement, + expressionStatement, + identifier, + isStatement, + isStringLiteral, + stringLiteral, + validate +} = _t; + +function populatePlaceholders(metadata, replacements) { + const ast = cloneNode(metadata.ast); + + if (replacements) { + metadata.placeholders.forEach(placeholder => { + if (!Object.prototype.hasOwnProperty.call(replacements, placeholder.name)) { + const placeholderName = placeholder.name; + throw new Error(`Error: No substitution given for "${placeholderName}". If this is not meant to be a + placeholder you may want to consider passing one of the following options to @babel/template: + - { placeholderPattern: false, placeholderWhitelist: new Set(['${placeholderName}'])} + - { placeholderPattern: /^${placeholderName}$/ }`); + } + }); + Object.keys(replacements).forEach(key => { + if (!metadata.placeholderNames.has(key)) { + throw new Error(`Unknown substitution "${key}" given`); + } + }); + } + + metadata.placeholders.slice().reverse().forEach(placeholder => { + try { + applyReplacement(placeholder, ast, replacements && replacements[placeholder.name] || null); + } catch (e) { + e.message = `@babel/template placeholder "${placeholder.name}": ${e.message}`; + throw e; + } + }); + return ast; +} + +function applyReplacement(placeholder, ast, replacement) { + if (placeholder.isDuplicate) { + if (Array.isArray(replacement)) { + replacement = replacement.map(node => cloneNode(node)); + } else if (typeof replacement === "object") { + replacement = cloneNode(replacement); + } + } + + const { + parent, + key, + index + } = placeholder.resolve(ast); + + if (placeholder.type === "string") { + if (typeof replacement === "string") { + replacement = stringLiteral(replacement); + } + + if (!replacement || !isStringLiteral(replacement)) { + throw new Error("Expected string substitution"); + } + } else if (placeholder.type === "statement") { + if (index === undefined) { + if (!replacement) { + replacement = emptyStatement(); + } else if (Array.isArray(replacement)) { + replacement = blockStatement(replacement); + } else if (typeof replacement === "string") { + replacement = expressionStatement(identifier(replacement)); + } else if (!isStatement(replacement)) { + replacement = expressionStatement(replacement); + } + } else { + if (replacement && !Array.isArray(replacement)) { + if (typeof replacement === "string") { + replacement = identifier(replacement); + } + + if (!isStatement(replacement)) { + replacement = expressionStatement(replacement); + } + } + } + } else if (placeholder.type === "param") { + if (typeof replacement === "string") { + replacement = identifier(replacement); + } + + if (index === undefined) throw new Error("Assertion failure."); + } else { + if (typeof replacement === "string") { + replacement = identifier(replacement); + } + + if (Array.isArray(replacement)) { + throw new Error("Cannot replace single expression with an array."); + } + } + + if (index === undefined) { + validate(parent, key, replacement); + parent[key] = replacement; + } else { + const items = parent[key].slice(); + + if (placeholder.type === "statement" || placeholder.type === "param") { + if (replacement == null) { + items.splice(index, 1); + } else if (Array.isArray(replacement)) { + items.splice(index, 1, ...replacement); + } else { + items[index] = replacement; + } + } else { + items[index] = replacement; + } + + validate(parent, key, items); + parent[key] = items; + } +}
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