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63 lines
3.1 KiB
JavaScript
63 lines
3.1 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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Nesting ignoreCase (`i`) 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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Atom :: `(` `?` RegularExpressionFlags `-` RegularExpressionFlags `:` Disjunction `)`
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1. Let addModifiers be the source text matched by the first RegularExpressionFlags.
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2. Let removeModifiers be the source text matched by the second RegularExpressionFlags.
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3. Let newModifiers be UpdateModifiers(modifiers, CodePointsToString(addModifiers), CodePointsToString(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|(?-i:b|(?i:c)|d|(?-i:e)|f)|g|(?i:h)|k/i;
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assert(re1.test("A"), "`a` should match `A`");
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assert(!re1.test("B"), "`b` should not match `B`");
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assert(re1.test("C"), "`c` should match `C`");
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assert(!re1.test("D"), "`d` should not match `D`");
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assert(!re1.test("E"), "`e` should not match `E`");
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assert(!re1.test("F"), "`f` should not match `F`");
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assert(re1.test("G"), "`g` should match `G`");
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assert(re1.test("H"), "`h` should match `H`");
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assert(re1.test("K"), "`k` should match `K`");
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var re2 = /a|(?i:b|(?-i:c)|d|(?i:e)|f)|g|(?-i:h)|k/;
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assert(!re2.test("A"), "`a` should not match `A`");
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assert(re2.test("B"), "`b` should match `B`");
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assert(!re2.test("C"), "`c` should not match `C`");
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assert(re2.test("D"), "`d` should match `D`");
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assert(re2.test("E"), "`e` should match `E`");
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assert(re2.test("F"), "`f` should match `F`");
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assert(!re2.test("G"), "`g` should not match `G`");
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assert(!re2.test("H"), "`h` should not match `H`");
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assert(!re2.test("K"), "`k` should not match `K`");
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