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index.js
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index.js
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const { version } = require('./package.json');
const { replace } = require('./options');
const isString = require('./common/isString');
const create = require('./common/create');
const reAll = /\*\s*/;
const reAllAtFirst = /^\*/;
const reAliasSep = /\s+as\s+/;
const reAllAsAlias = /\*\s*as\s*/;
const reAliases = /((,?\s*)[$0-9a-zA-Z_]+\s+as\s+[$0-9a-zA-Z_]+)/g;
const reFunctionAtFirst = /^function/;
const reAllWithFromExpression = /\*\s+from\s+(['"`][~@$0-9a-zA-Z_\s-.\/]+['"`])/gm;
const reWithFromExpression = /^(([*0-9a-zA-Z_,\s]+)?\s+from\s+(['"`][~@$0-9a-zA-Z_\s-.\/]+['"`])?|[0-9a-zA-Z_,]+)/gm;
const reOpeningBraceAtFirst = /^\{/;
const reOpeningAtFirstAndOrClosingBraceAtEnd = /^\{\s*|\s*\}$/g;
const reAnyBraceOrComma = /(\{)\s*|\s*(,)\s*|\s*(\})$/g;
const reBraceOpeningAtFristOrCommaOrBraceClosing = /^\{\s*|\s*(,)\s*|\s*\}$/g;
const reBraceOpeningOrCommaOrBraceClosing = /\{\s*|\s*(,)\s*|\s*\}/g;
const reImportExpressionWithDefault = /^(?!\{)(?:([0-9a-zA-Z_]+))\s*,\s*(\{?\s*[*0-9a-zA-Z_,\s]+\s*\}?)\s+/;
const reImportDeclaration = /^(?!\/\/|\*)import\s+(((?:[0-9a-zA-Z_]+\s*,\s*)?\{?\s*[$*0-9a-zA-Z_,\s]+\s*\}?)\s+from\s+)?(['"`][~@$0-9a-zA-Z_\s-.\/]+['"`])/gm;
const reExportDeclaration = /^export\s+(default)?\s*(const|let|var|class[^{]*|interface[^{]*|function[^(]*|\(.*\)[^>]*|\*\s+from\s+['"`][~@$0-9a-zA-Z_\s-.\/]+['"`]|[0-9a-zA-Z_{*\s,}]+from\s+['"`][~@$0-9a-zA-Z_\s-.\/]+['"`]|[0-9a-zA-Z_{}\s*,]+)?\s*([0-9a-zA-Z_]+)?/gm;
const reExportSimply = /^export\s*/;
let opts = create(null);
function transform(source, options) {
opts = replace(options);
source = isString(source) ? source : '';
return transformExportDeclarations(transformImportDeclarations(source, opts), opts);
}
function reduceAliases(aliases, item) {
reAliasSep.lastIndex = 0;
if (reAliasSep.test(item)) {
aliases[aliases.length] = item;
}
return aliases;
}
function parseExpression($match, $exp, $uri) {
reOpeningAtFirstAndOrClosingBraceAtEnd.lastIndex = 0;
reBraceOpeningAtFristOrCommaOrBraceClosing.lastIndex = 0;
reAllAsAlias.lastIndex = 0;
reAll.lastIndex = 0;
if (reOpeningAtFirstAndOrClosingBraceAtEnd.test($exp)) {
const expressions = $exp.replace(reBraceOpeningAtFristOrCommaOrBraceClosing, '$1').split(',');
const expressionWithoutAliases = $exp.replace(reAliases, '').replace(/(?:^(\{\s*),*)/g, '$1');
const aliases = expressions.reduce(reduceAliases, []);
const named = `const ${expressionWithoutAliases} = require(${$uri});`;
return aliases.reduce((accumulator, item, index, list) => {
const chunk = item.replace(reAliasSep, ',').split(',');
const semicolon = index === list.length - 1 ? '' : ';';
accumulator[accumulator.length] = `const ${chunk[1]} = require(${$uri}).${chunk[0]}${semicolon}`;
return accumulator;
}, [named]).join('\n');
} else if (reAll.test($exp)) {
return `const ${$exp.replace(reAllAsAlias, '')} = require(${$uri})`;
}
return '';
}
function parseDefaultExpression($match, $exp, $uri) {
reAnyBraceOrComma.lastIndex = 0;
const raw = $exp.replace(reAnyBraceOrComma, '$1$2$3');
const brackeIndex = raw.indexOf(',{');
const sepIndex = raw.indexOf(',*');
let rawName;
let rawExpression;
if (~brackeIndex) {
rawName = raw.substr(0, brackeIndex);
rawExpression = raw.substr(brackeIndex + 1, raw.length);
} else if (~sepIndex) {
rawName = raw.substr(0, sepIndex);
rawExpression = raw.substr(sepIndex + 1, raw.length);
}
const defaultData = `const ${rawName} = require(${$uri}).default || require(${$uri})`;
const expressions = parseExpression(rawExpression, $uri);
return `${defaultData}\n${expressions}`;
}
function parseImportDeclaration($match, $var, $exp, $uri) {
reImportExpressionWithDefault.lastIndex = 0;
$uri = $uri.replace(opts.pattern, opts.replacement);
if (reImportExpressionWithDefault.test($exp)) {
return parseDefaultExpression($match, $exp, $uri);
} else if (reAliasSep.test($exp)) {
return parseExpression($match, $exp, $uri);
} else if ($exp === undefined) {
return `require(${$uri})`;
}
return `const ${$exp} = require(${$uri})`;
}
function transformImportDeclarations(source) {
reImportDeclaration.lastIndex = 0;
return source.replace(reImportDeclaration, parseImportDeclaration);
}
function parseDefaultValue($match, $val, $key) {
return `module.exports = ${$val || $key || ''}`;
}
function reduceExportExpression($uri, $list, $item) {
reAliasSep.lastIndex = 0;
const chunk = $item.replace(reAliasSep, ',').split(',');
if ($uri) {
$uri = $uri.replace(opts.pattern, opts.replacement);
if (chunk.length === 1) {
$list[$list.length] = `exports.${chunk[0]} = require(${$uri})`;
} else if (chunk[0] === 'default') {
$list[$list.length] = `exports.${chunk[1]} = require(${$uri})`;
} else {
$list[$list.length] = `exports.${chunk[1]} = require(${$uri}).${chunk[0]}`;
}
} else if (chunk[0] === 'default' === false) {
$list[$list.length] = `exports.${chunk[0]} = ${chunk[0]}`;
}
return $list;
}
function parseExportExpression($match, $raw, $exp, $uri) {
const reducer = reduceExportExpression.bind(this, $uri);
const expressions = ($exp || $raw).split(',').reduce(reducer, []);
return expressions.join('\n');
}
function parseExportDeclaration($match, $def, $val, $key) {
reOpeningBraceAtFirst.lastIndex = 0;
reBraceOpeningOrCommaOrBraceClosing.lastIndex = 0;
reExportSimply.lastIndex = 0;
reAllWithFromExpression.lastIndex = 0;
reAllAtFirst.lastIndex = 0;
reWithFromExpression.lastIndex = 0;
reFunctionAtFirst.lastIndex = 0;
if ($def === 'default') {
return parseDefaultValue($match, $val, $key);
} else if (reOpeningBraceAtFirst.test($val)) {
$val = $val.replace(reBraceOpeningOrCommaOrBraceClosing, '$1');
const expressions = $val.replace(reBraceOpeningAtFristOrCommaOrBraceClosing, '$1').split(',');
return expressions.reduce((accumulator, item, index, list) => {
const comma = index === list.length - 1 ? '' : ';';
if (reAliasSep.test(item)) {
let expression = item.split(reAliasSep);
if (expression[0] === 'default' && reWithFromExpression.test(expression[1])) {
expression = expression[1].replace(reWithFromExpression, '$2,$3').split(',');
expression[1] = expression[1].replace(opts.pattern, opts.replacement);
accumulator[accumulator.length] = `exports.${expression[0]} = require(${expression[1]})${comma}`;
} else {
accumulator[accumulator.length] = `exports.${expression[1]} = ${expression[0]}${comma}`;
}
} else {
accumulator[accumulator.length] = `exports.${item} = ${item}${comma}`;
}
return accumulator;
}, []).join('\n');
} else if (reFunctionAtFirst.test($val)) {
return `exports.${$key} = ${$match.replace(reExportSimply, '')}`;
} else if (reAllAtFirst.test($val)) {
const uri = $val.replace(reAllWithFromExpression, '$1').replace(opts.pattern, opts.replacement);
return [
'(function (resource) {',
'\tfor (const name in resource) {',
'\t\tif (name === \'default\' === false) {',
'\t\t\tthis[name] = resource[name];',
'\t\t}',
'\t}',
`}).call(exports, require(${uri}))`].join('\n');
}
return `exports.${$key}`;
}
function transformExportDeclarations($source) {
reExportDeclaration.lastIndex = 0;
return $source.replace(reExportDeclaration, parseExportDeclaration);
}
transform.VERSION = version;
module.exports = transform;