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@glimmer/syntax

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// eslint-disable-next-line import/no-extraneous-dependencies import { UNKNOWN_POSITION } from '../location'; import { match, MatchAny } from './match'; import { span } from './span'; /** * Used to indicate that an attempt to convert a `SourcePosition` to a character offset failed. It * is separate from `null` so that `null` can be used to indicate that the computation wasn't yet * attempted (and therefore to cache the failure) */ export const BROKEN = 'BROKEN'; /** * A `SourceOffset` represents a single position in the source. * * There are three kinds of backing data for `SourceOffset` objects: * * - `CharPosition`, which contains a character offset into the raw source string * - `HbsPosition`, which contains a `SourcePosition` from the Handlebars AST, which can be * converted to a `CharPosition` on demand. * - `InvisiblePosition`, which represents a position not in source (@see {InvisiblePosition}) */ export class SourceOffset { constructor(data) { this.data = data; } /** * Create a `SourceOffset` from a Handlebars `SourcePosition`. It's stored as-is, and converted * into a character offset on demand, which avoids unnecessarily computing the offset of every * `SourceLocation`, but also means that broken `SourcePosition`s are not always detected. */ static forHbsPos(source, pos) { return new HbsPosition(source, pos, null).wrap(); } /** * Create a `SourceOffset` that corresponds to a broken `SourcePosition`. This means that the * calling code determined (or knows) that the `SourceLocation` doesn't correspond correctly to * any part of the source. */ static broken(pos = UNKNOWN_POSITION) { return new InvisiblePosition("Broken" /* Broken */ , pos).wrap(); } /** * Get the character offset for this `SourceOffset`, if possible. */ get offset() { let charPos = this.data.toCharPos(); return charPos === null ? null : charPos.offset; } /** * Compare this offset with another one. * * If both offsets are `HbsPosition`s, they're equivalent as long as their lines and columns are * the same. This avoids computing offsets unnecessarily. * * Otherwise, two `SourceOffset`s are equivalent if their successfully computed character offsets * are the same. */ eql(right) { return eql(this.data, right.data); } /** * Create a span that starts from this source offset and ends with another source offset. Avoid * computing character offsets if both `SourceOffset`s are still lazy. */ until(other) { return span(this.data, other.data); } /** * Create a `SourceOffset` by moving the character position represented by this source offset * forward or backward (if `by` is negative), if possible. * * If this `SourceOffset` can't compute a valid character offset, `move` returns a broken offset. * * If the resulting character offset is less than 0 or greater than the size of the source, `move` * returns a broken offset. */ move(by) { let charPos = this.data.toCharPos(); if (charPos === null) { return SourceOffset.broken(); } else { let result = charPos.offset + by; if (charPos.source.check(result)) { return new CharPosition(charPos.source, result).wrap(); } else { return SourceOffset.broken(); } } } /** * Create a new `SourceSpan` that represents a collapsed range at this source offset. Avoid * computing the character offset if it has not already been computed. */ collapsed() { return span(this.data, this.data); } /** * Convert this `SourceOffset` into a Handlebars {@see SourcePosition} for compatibility with * existing plugins. */ toJSON() { return this.data.toJSON(); } } export class CharPosition { constructor(source, charPos) { this.source = source; this.charPos = charPos; this.kind = "CharPosition" /* CharPosition */ ; /** Computed from char offset */ this._locPos = null; } /** * This is already a `CharPosition`. * * {@see HbsPosition} for the alternative. * * @implements {PositionData} */ toCharPos() { return this; } /** * Produce a Handlebars {@see SourcePosition} for this `CharPosition`. If this `CharPosition` was * computed using {@see SourceOffset#move}, this will compute the `SourcePosition` for the offset. * * @implements {PositionData} */ toJSON() { let hbs = this.toHbsPos(); return hbs === null ? UNKNOWN_POSITION : hbs.toJSON(); } wrap() { return new SourceOffset(this); } /** * A `CharPosition` always has an offset it can produce without any additional computation. */ get offset() { return this.charPos; } /** * Convert the current character offset to an `HbsPosition`, if it was not already computed. Once * a `CharPosition` has computed its `HbsPosition`, it will not need to do compute it again, and * the same `CharPosition` is retained when used as one of the ends of a `SourceSpan`, so * computing the `HbsPosition` should be a one-time operation. */ toHbsPos() { let locPos = this._locPos; if (locPos === null) { let hbsPos = this.source.hbsPosFor(this.charPos); if (hbsPos === null) { this._locPos = locPos = BROKEN; } else { this._locPos = locPos = new HbsPosition(this.source, hbsPos, this.charPos); } } return locPos === BROKEN ? null : locPos; } } export class HbsPosition { constructor(source, hbsPos, charPos = null) { this.source = source; this.hbsPos = hbsPos; this.kind = "HbsPosition" /* HbsPosition */ ; this._charPos = charPos === null ? null : new CharPosition(source, charPos); } /** * Lazily compute the character offset from the {@see SourcePosition}. Once an `HbsPosition` has * computed its `CharPosition`, it will not need to do compute it again, and the same * `HbsPosition` is retained when used as one of the ends of a `SourceSpan`, so computing the * `CharPosition` should be a one-time operation. * * @implements {PositionData} */ toCharPos() { let charPos = this._charPos; if (charPos === null) { let charPosNumber = this.source.charPosFor(this.hbsPos); if (charPosNumber === null) { this._charPos = charPos = BROKEN; } else { this._charPos = charPos = new CharPosition(this.source, charPosNumber); } } return charPos === BROKEN ? null : charPos; } /** * Return the {@see SourcePosition} that this `HbsPosition` was instantiated with. This operation * does not need to compute anything. * * @implements {PositionData} */ toJSON() { return this.hbsPos; } wrap() { return new SourceOffset(this); } /** * This is already an `HbsPosition`. * * {@see CharPosition} for the alternative. */ toHbsPos() { return this; } } export class InvisiblePosition { constructor(kind, // whatever was provided, possibly broken pos) { this.kind = kind; this.pos = pos; } /** * A broken position cannot be turned into a {@see CharacterPosition}. */ toCharPos() { return null; } /** * The serialization of an `InvisiblePosition is whatever Handlebars {@see SourcePosition} was * originally identified as broken, non-existent or synthetic. * * If an `InvisiblePosition` never had an source offset at all, this method returns * {@see UNKNOWN_POSITION} for compatibility. */ toJSON() { return this.pos; } wrap() { return new SourceOffset(this); } get offset() { return null; } } /** * Compare two {@see AnyPosition} and determine whether they are equal. * * @see {SourceOffset#eql} */ const eql = match(m => m.when("HbsPosition" /* HbsPosition */ , "HbsPosition" /* HbsPosition */ , ({ hbsPos: left }, { hbsPos: right }) => left.column === right.column && left.line === right.line).when("CharPosition" /* CharPosition */ , "CharPosition" /* CharPosition */ , ({ charPos: left }, { charPos: right }) => left === right).when("CharPosition" /* CharPosition */ , "HbsPosition" /* HbsPosition */ , ({ offset: left }, right) => { var _a; return left === ((_a = right.toCharPos()) === null || _a === void 0 ? void 0 : _a.offset); }).when("HbsPosition" /* HbsPosition */ , "CharPosition" /* CharPosition */ , (left, { offset: right }) => { var _a; return ((_a = left.toCharPos()) === null || _a === void 0 ? void 0 : _a.offset) === right; }).when(MatchAny, MatchAny, () => false)); //# 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eslint-disable-next-line import/no-extraneous-dependencies\nimport { SourcePosition, UNKNOWN_POSITION } from '../location';\nimport { Source } from '../source';\nimport { match, MatchAny } from './match';\nimport { SourceSpan, span } from './span';\n\nexport const enum OffsetKind {\n  /**\n   * We have already computed the character position of this offset or span.\n   */\n  CharPosition = 'CharPosition',\n\n  /**\n   * This offset or span was instantiated with a Handlebars SourcePosition or SourceLocation. Its\n   * character position will be computed on demand.\n   */\n  HbsPosition = 'HbsPosition',\n\n  /**\n   * for (rare) situations where a node is created but there was no source location (e.g. the name\n   * \"default\" in default blocks when the word \"default\" never appeared in source). This is used\n   * by the internals when there is a legitimate reason for the internals to synthesize a node\n   * with no location.\n   */\n  InternalsSynthetic = 'InternalsSynthetic',\n  /**\n   * For situations where a node represents zero parts of the source (for example, empty arguments).\n   * In general, we attempt to assign these nodes *some* position (empty arguments can be\n   * positioned immediately after the callee), but it's not always possible\n   */\n  NonExistent = 'NonExistent',\n  /**\n   * For situations where a source location was expected, but it didn't correspond to the node in\n   * the source. This happens if a plugin creates broken locations.\n   */\n  Broken = 'Broken',\n}\n\n/**\n * All positions have these details in common. Most notably, all three kinds of positions can\n * must be able to attempt to convert themselves into {@see CharPosition}.\n */\nexport interface PositionData {\n  readonly kind: OffsetKind;\n  toCharPos(): CharPosition | null;\n  toJSON(): SourcePosition;\n}\n\n/**\n * Used to indicate that an attempt to convert a `SourcePosition` to a character offset failed. It\n * is separate from `null` so that `null` can be used to indicate that the computation wasn't yet\n * attempted (and therefore to cache the failure)\n */\nexport const BROKEN = 'BROKEN';\nexport type BROKEN = 'BROKEN';\n\nexport type AnyPosition = HbsPosition | CharPosition | InvisiblePosition;\n\n/**\n * A `SourceOffset` represents a single position in the source.\n *\n * There are three kinds of backing data for `SourceOffset` objects:\n *\n * - `CharPosition`, which contains a character offset into the raw source string\n * - `HbsPosition`, which contains a `SourcePosition` from the Handlebars AST, which can be\n *   converted to a `CharPosition` on demand.\n * - `InvisiblePosition`, which represents a position not in source (@see {InvisiblePosition})\n */\nexport class SourceOffset {\n  /**\n   * Create a `SourceOffset` from a Handlebars `SourcePosition`. It's stored as-is, and converted\n   * into a character offset on demand, which avoids unnecessarily computing the offset of every\n   * `SourceLocation`, but also means that broken `SourcePosition`s are not always detected.\n   */\n  static forHbsPos(source: Source, pos: SourcePosition): SourceOffset {\n    return new HbsPosition(source, pos, null).wrap();\n  }\n\n  /**\n   * Create a `SourceOffset` that corresponds to a broken `SourcePosition`. This means that the\n   * calling code determined (or knows) that the `SourceLocation` doesn't correspond correctly to\n   * any part of the source.\n   */\n  static broken(pos: SourcePosition = UNKNOWN_POSITION): SourceOffset {\n    return new InvisiblePosition(OffsetKind.Broken, pos).wrap();\n  }\n\n  constructor(readonly data: PositionData & AnyPosition) {}\n\n  /**\n   * Get the character offset for this `SourceOffset`, if possible.\n   */\n  get offset(): number | null {\n    let charPos = this.data.toCharPos();\n    return charPos === null ? null : charPos.offset;\n  }\n\n  /**\n   * Compare this offset with another one.\n   *\n   * If both offsets are `HbsPosition`s, they're equivalent as long as their lines and columns are\n   * the same. This avoids computing offsets unnecessarily.\n   *\n   * Otherwise, two `SourceOffset`s are equivalent if their successfully computed character offsets\n   * are the same.\n   */\n  eql(right: SourceOffset): boolean {\n    return eql(this.data, right.data);\n  }\n\n  /**\n   * Create a span that starts from this source offset and ends with another source offset. Avoid\n   * computing character offsets if both `SourceOffset`s are still lazy.\n   */\n  until(other: SourceOffset): SourceSpan {\n    return span(this.data, other.data);\n  }\n\n  /**\n   * Create a `SourceOffset` by moving the character position represented by this source offset\n   * forward or backward (if `by` is negative), if possible.\n   *\n   * If this `SourceOffset` can't compute a valid character offset, `move` returns a broken offset.\n   *\n   * If the resulting character offset is less than 0 or greater than the size of the source, `move`\n   * returns a broken offset.\n   */\n  move(by: number): SourceOffset {\n    let charPos = this.data.toCharPos();\n\n    if (charPos === null) {\n      return SourceOffset.broken();\n    } else {\n      let result = charPos.offset + by;\n\n      if (charPos.source.check(result)) {\n        return new CharPosition(charPos.source, result).wrap();\n      } else {\n        return SourceOffset.broken();\n      }\n    }\n  }\n\n  /**\n   * Create a new `SourceSpan` that represents a collapsed range at this source offset. Avoid\n   * computing the character offset if it has not already been computed.\n   */\n  collapsed(): SourceSpan {\n    return span(this.data, this.data);\n  }\n\n  /**\n   * Convert this `SourceOffset` into a Handlebars {@see SourcePosition} for compatibility with\n   * existing plugins.\n   */\n  toJSON(): SourcePosition {\n    return this.data.toJSON();\n  }\n}\n\nexport class CharPosition implements PositionData {\n  readonly kind = OffsetKind.CharPosition;\n\n  /** Computed from char offset */\n  _locPos: HbsPosition | BROKEN | null = null;\n\n  constructor(readonly source: Source, readonly charPos: number) {}\n\n  /**\n   * This is already a `CharPosition`.\n   *\n   * {@see HbsPosition} for the alternative.\n   *\n   * @implements {PositionData}\n   */\n  toCharPos(): CharPosition {\n    return this;\n  }\n\n  /**\n   * Produce a Handlebars {@see SourcePosition} for this `CharPosition`. If this `CharPosition` was\n   * computed using {@see SourceOffset#move}, this will compute the `SourcePosition` for the offset.\n   *\n   * @implements {PositionData}\n   */\n  toJSON(): SourcePosition {\n    let hbs = this.toHbsPos();\n    return hbs === null ? UNKNOWN_POSITION : hbs.toJSON();\n  }\n\n  wrap(): SourceOffset {\n    return new SourceOffset(this);\n  }\n\n  /**\n   * A `CharPosition` always has an offset it can produce without any additional computation.\n   */\n  get offset(): number {\n    return this.charPos;\n  }\n\n  /**\n   * Convert the current character offset to an `HbsPosition`, if it was not already computed. Once\n   * a `CharPosition` has computed its `HbsPosition`, it will not need to do compute it again, and\n   * the same `CharPosition` is retained when used as one of the ends of a `SourceSpan`, so\n   * computing the `HbsPosition` should be a one-time operation.\n   */\n  toHbsPos(): HbsPosition | null {\n    let locPos = this._locPos;\n\n    if (locPos === null) {\n      let hbsPos = this.source.hbsPosFor(this.charPos);\n\n      if (hbsPos === null) {\n        this._locPos = locPos = BROKEN;\n      } else {\n        this._locPos = locPos = new HbsPosition(this.source, hbsPos, this.charPos);\n      }\n    }\n\n    return locPos === BROKEN ? null : locPos;\n  }\n}\n\nexport class HbsPosition implements PositionData {\n  readonly kind = OffsetKind.HbsPosition;\n\n  _charPos: CharPosition | BROKEN | null;\n\n  constructor(\n    readonly source: Source,\n    readonly hbsPos: SourcePosition,\n    charPos: number | null = null\n  ) {\n    this._charPos = charPos === null ? null : new CharPosition(source, charPos);\n  }\n\n  /**\n   * Lazily compute the character offset from the {@see SourcePosition}. Once an `HbsPosition` has\n   * computed its `CharPosition`, it will not need to do compute it again, and the same\n   * `HbsPosition` is retained when used as one of the ends of a `SourceSpan`, so computing the\n   * `CharPosition` should be a one-time operation.\n   *\n   * @implements {PositionData}\n   */\n  toCharPos(): CharPosition | null {\n    let charPos = this._charPos;\n\n    if (charPos === null) {\n      let charPosNumber = this.source.charPosFor(this.hbsPos);\n\n      if (charPosNumber === null) {\n        this._charPos = charPos = BROKEN;\n      } else {\n        this._charPos = charPos = new CharPosition(this.source, charPosNumber);\n      }\n    }\n\n    return charPos === BROKEN ? null : charPos;\n  }\n\n  /**\n   * Return the {@see SourcePosition} that this `HbsPosition` was instantiated with. This operation\n   * does not need to compute anything.\n   *\n   * @implements {PositionData}\n   */\n  toJSON(): SourcePosition {\n    return this.hbsPos;\n  }\n\n  wrap(): SourceOffset {\n    return new SourceOffset(this);\n  }\n\n  /**\n   * This is already an `HbsPosition`.\n   *\n   * {@see CharPosition} for the alternative.\n   */\n  toHbsPos(): HbsPosition {\n    return this;\n  }\n}\n\nexport class InvisiblePosition implements PositionData {\n  constructor(\n    readonly kind: OffsetKind.Broken | OffsetKind.InternalsSynthetic | OffsetKind.NonExistent,\n    // whatever was provided, possibly broken\n    readonly pos: SourcePosition\n  ) {}\n\n  /**\n   * A broken position cannot be turned into a {@see CharacterPosition}.\n   */\n  toCharPos(): null {\n    return null;\n  }\n\n  /**\n   * The serialization of an `InvisiblePosition is whatever Handlebars {@see SourcePosition} was\n   * originally identified as broken, non-existent or synthetic.\n   *\n   * If an `InvisiblePosition` never had an source offset at all, this method returns\n   * {@see UNKNOWN_POSITION} for compatibility.\n   */\n  toJSON(): SourcePosition {\n    return this.pos;\n  }\n\n  wrap(): SourceOffset {\n    return new SourceOffset(this);\n  }\n\n  get offset(): null {\n    return null;\n  }\n}\n\n/**\n * Compare two {@see AnyPosition} and determine whether they are equal.\n *\n * @see {SourceOffset#eql}\n */\nconst eql = match<boolean>((m) =>\n  m\n    .when(\n      OffsetKind.HbsPosition,\n      OffsetKind.HbsPosition,\n      ({ hbsPos: left }, { hbsPos: right }) =>\n        left.column === right.column && left.line === right.line\n    )\n    .when(\n      OffsetKind.CharPosition,\n      OffsetKind.CharPosition,\n      ({ charPos: left }, { charPos: right }) => left === right\n    )\n    .when(\n      OffsetKind.CharPosition,\n      OffsetKind.HbsPosition,\n      ({ offset: left }, right) => left === right.toCharPos()?.offset\n    )\n    .when(\n      OffsetKind.HbsPosition,\n      OffsetKind.CharPosition,\n      (left, { offset: right }) => left.toCharPos()?.offset === right\n    )\n    .when(MatchAny, MatchAny, () => false)\n);\n"],"sourceRoot":""}