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Merge pull request #11 from savetheclocktower/add-variables
Add variables
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@@ -1 +1,2 @@ | ||
node_modules | ||
.tool-versions |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,100 @@ | ||
const ESCAPES = { | ||
u: (flags) => { | ||
flags.lowercaseNext = false | ||
flags.uppercaseNext = true | ||
}, | ||
l: (flags) => { | ||
flags.uppercaseNext = false | ||
flags.lowercaseNext = true | ||
}, | ||
U: (flags) => { | ||
flags.lowercaseAll = false | ||
flags.uppercaseAll = true | ||
}, | ||
L: (flags) => { | ||
flags.uppercaseAll = false | ||
flags.lowercaseAll = true | ||
}, | ||
E: (flags) => { | ||
flags.uppercaseAll = false | ||
flags.lowercaseAll = false | ||
}, | ||
r: (flags, result) => { | ||
result.push('\\r') | ||
}, | ||
n: (flags, result) => { | ||
result.push('\\n') | ||
}, | ||
$: (flags, result) => { | ||
result.push('$') | ||
} | ||
} | ||
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function transformTextWithFlags (str, flags) { | ||
if (flags.uppercaseAll) { | ||
return str.toUpperCase() | ||
} else if (flags.lowercaseAll) { | ||
return str.toLowerCase() | ||
} else if (flags.uppercaseNext) { | ||
flags.uppercaseNext = false | ||
return str.replace(/^./, s => s.toUpperCase()) | ||
} else if (flags.lowercaseNext) { | ||
return str.replace(/^./, s => s.toLowerCase()) | ||
} | ||
return str | ||
} | ||
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// `Replacer` handles shared substitution semantics for tabstop and variable | ||
// transformations. | ||
class Replacer { | ||
constructor (tokens) { | ||
this.tokens = [...tokens] | ||
this.resetFlags() | ||
} | ||
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resetFlags () { | ||
this.flags = { | ||
uppercaseAll: false, | ||
lowercaseAll: false, | ||
uppercaseNext: false, | ||
lowercaseNext: false | ||
} | ||
} | ||
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replace (...match) { | ||
let result = [] | ||
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function handleToken (token) { | ||
if (typeof token === 'string') { | ||
result.push(transformTextWithFlags(token, this.flags)) | ||
} else if (token.escape) { | ||
ESCAPES[token.escape](this.flags, result) | ||
} else if (token.backreference) { | ||
let {iftext, elsetext} = token | ||
if (iftext != null && elsetext != null) { | ||
// If-else syntax makes choices based on the presence or absence of a | ||
// capture group backreference. | ||
let m = match[token.backreference] | ||
let tokenToHandle = m ? iftext : elsetext | ||
if (Array.isArray(tokenToHandle)) { | ||
result.push(...tokenToHandle.map(handleToken.bind(this))) | ||
} else { | ||
result.push(handleToken.call(this, tokenToHandle)) | ||
} | ||
} else { | ||
let transformed = transformTextWithFlags( | ||
match[token.backreference], | ||
this.flags | ||
) | ||
result.push(transformed) | ||
} | ||
} | ||
} | ||
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this.tokens.forEach(handleToken.bind(this)) | ||
return result.join('') | ||
} | ||
} | ||
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module.exports = Replacer |
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