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49 lines
2.5 KiB
JavaScript
49 lines
2.5 KiB
JavaScript
// Copyright 2024 Daniel Kwan. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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author: Daniel Kwan
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description: >
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Adding multiline (`m`) modifier should not affect alternatives outside.
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info: |
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Runtime Semantics: CompileAtom
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The syntax-directed operation CompileAtom takes arguments direction (forward or backward) and modifiers (a Modifiers Record) and returns a Matcher.
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Atom :: `(` `?` RegularExpressionFlags `:` Disjunction `)`
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1. Let addModifiers be the source text matched by RegularExpressionFlags.
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2. Let removeModifiers be the empty String.
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3. Let newModifiers be UpdateModifiers(modifiers, CodePointsToString(addModifiers), removeModifiers).
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4. Return CompileSubpattern of Disjunction with arguments direction and newModifiers.
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UpdateModifiers ( modifiers, add, remove )
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The abstract operation UpdateModifiers takes arguments modifiers (a Modifiers Record), add (a String), and remove (a String) and returns a Modifiers. It performs the following steps when called:
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1. Let dotAll be modifiers.[[DotAll]].
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2. Let ignoreCase be modifiers.[[IgnoreCase]].
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3. Let multiline be modifiers.[[Multiline]].
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4. If add contains "s", set dotAll to true.
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5. If add contains "i", set ignoreCase to true.
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6. If add contains "m", set multiline to true.
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7. If remove contains "s", set dotAll to false.
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8. If remove contains "i", set ignoreCase to false.
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9. If remove contains "m", set multiline to false.
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10. Return the Modifiers Record { [[DotAll]]: dotAll, [[IgnoreCase]]: ignoreCase, [[Multiline]]: multiline }.
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esid: sec-compileatom
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features: [regexp-modifiers]
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---*/
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var re1 = /^a$|^b$|(?m:^c$)|^d$|^e$/;
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assert(!re1.test("\na\n"), "Alternative `^a$` should not match newline");
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assert(!re1.test("\nb\n"), "Alternative `^b$` should not match newline");
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assert(re1.test("\nc\n"), "Alternative `(?m:^c$)` should match newline in modified group");
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assert(!re1.test("\nd\n"), "Alternative `^d$` should not match newline");
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assert(!re1.test("\ne\n"), "Alternative `^e$` should not match newline");
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var re2 = /(^a$)|(?:^b$)|(?m:^c$)|(?:^d$)|(^e$)/;
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assert(!re2.test("\na\n"), "Alternative `(^a$)` should not match newline");
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assert(!re2.test("\nb\n"), "Alternative `(?:^b$)` should not match newline");
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assert(re2.test("\nc\n"), "Alternative `(?m:^c$)` should match newline in modified group");
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assert(!re2.test("\nd\n"), "Alternative `(?:^d$)` should not match newline");
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assert(!re2.test("\ne\n"), "Alternative `(^e$)` should not match newline");
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