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66 lines
2.2 KiB
JavaScript
66 lines
2.2 KiB
JavaScript
// Copyright 2023 Ron Buckton. 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: Ron Buckton
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description: >
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Modifiers syntax `(?ims-:)` is legal.
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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 `-` 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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/(?i-:)/;
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/(?is-:)/;
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/(?im-:)/;
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/(?s-:)/;
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/(?si-:)/;
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/(?sm-:)/;
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/(?m-:)/;
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/(?mi-:)/;
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/(?ms-:)/;
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/(?ims-:)/;
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/(?ism-:)/;
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/(?sim-:)/;
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/(?smi-:)/;
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/(?mis-:)/;
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/(?msi-:)/;
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new RegExp("(?i-:)");
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new RegExp("(?is-:)");
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new RegExp("(?im-:)");
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new RegExp("(?s-:)");
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new RegExp("(?si-:)");
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new RegExp("(?sm-:)");
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new RegExp("(?m-:)");
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new RegExp("(?mi-:)");
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new RegExp("(?ms-:)");
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new RegExp("(?ims-:)");
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new RegExp("(?ism-:)");
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new RegExp("(?sim-:)");
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new RegExp("(?smi-:)");
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new RegExp("(?mis-:)");
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new RegExp("(?msi-:)");
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