feat(compiler): record end of expression Token (#33549)
In the past, only the starting index of an expression Token has been
recorded, so a parser could demarkate the span of a token only by the
start locations of two tokens. This may lead to trailing whitespace
being included in the token span:
```html
{{ token1 + token2 }}
^^^^^^^^^ recorded span of `token1`
```
It's also not enough for a parser to determine the end of a token by
adding the length of the token value to the token's start location,
because lexed expression values may not exactly reflect the source code.
For example, `"d\\"e"` is lexed as a string token whose value is `d"e`.
Instead, this commit adds a `end` field to expression tokens. `end`
is one past the last index of the token source code. This will enable a
parser to determine the span of a token just by looking at that token.
This is a breaking change because the contructor interface of `Token`
has changed.
Part of #33477.
PR Close #33549
This commit is contained in:
ayazhafiz
Alex Rickabaugh
parent
8410278b6d
commit
19944c2424
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@ -35,7 +35,7 @@ export class Lexer {
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export class Token {
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constructor(
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public index: number, public type: TokenType, public numValue: number,
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public index: number, public end: number, public type: TokenType, public numValue: number,
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public strValue: string) {}
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isCharacter(code: number): boolean {
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@ -91,35 +91,35 @@ export class Token {
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}
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}
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function newCharacterToken(index: number, code: number): Token {
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return new Token(index, TokenType.Character, code, String.fromCharCode(code));
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function newCharacterToken(index: number, end: number, code: number): Token {
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return new Token(index, end, TokenType.Character, code, String.fromCharCode(code));
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}
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function newIdentifierToken(index: number, text: string): Token {
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return new Token(index, TokenType.Identifier, 0, text);
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function newIdentifierToken(index: number, end: number, text: string): Token {
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return new Token(index, end, TokenType.Identifier, 0, text);
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}
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function newKeywordToken(index: number, text: string): Token {
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return new Token(index, TokenType.Keyword, 0, text);
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function newKeywordToken(index: number, end: number, text: string): Token {
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return new Token(index, end, TokenType.Keyword, 0, text);
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}
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function newOperatorToken(index: number, text: string): Token {
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return new Token(index, TokenType.Operator, 0, text);
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function newOperatorToken(index: number, end: number, text: string): Token {
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return new Token(index, end, TokenType.Operator, 0, text);
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}
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function newStringToken(index: number, text: string): Token {
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return new Token(index, TokenType.String, 0, text);
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function newStringToken(index: number, end: number, text: string): Token {
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return new Token(index, end, TokenType.String, 0, text);
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}
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function newNumberToken(index: number, n: number): Token {
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return new Token(index, TokenType.Number, n, '');
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function newNumberToken(index: number, end: number, n: number): Token {
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return new Token(index, end, TokenType.Number, n, '');
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}
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function newErrorToken(index: number, message: string): Token {
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return new Token(index, TokenType.Error, 0, message);
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function newErrorToken(index: number, end: number, message: string): Token {
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return new Token(index, end, TokenType.Error, 0, message);
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}
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export const EOF: Token = new Token(-1, TokenType.Character, 0, '');
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export const EOF: Token = new Token(-1, -1, TokenType.Character, 0, '');
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class _Scanner {
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length: number;
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@ -165,7 +165,7 @@ class _Scanner {
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case chars.$PERIOD:
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this.advance();
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return chars.isDigit(this.peek) ? this.scanNumber(start) :
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newCharacterToken(start, chars.$PERIOD);
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newCharacterToken(start, this.index, chars.$PERIOD);
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case chars.$LPAREN:
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case chars.$RPAREN:
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case chars.$LBRACE:
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@ -211,13 +211,13 @@ class _Scanner {
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scanCharacter(start: number, code: number): Token {
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this.advance();
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return newCharacterToken(start, code);
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return newCharacterToken(start, this.index, code);
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}
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scanOperator(start: number, str: string): Token {
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this.advance();
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return newOperatorToken(start, str);
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return newOperatorToken(start, this.index, str);
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}
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/**
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@ -243,7 +243,7 @@ class _Scanner {
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this.advance();
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str += three;
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}
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return newOperatorToken(start, str);
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return newOperatorToken(start, this.index, str);
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}
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scanIdentifier(): Token {
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@ -251,8 +251,8 @@ class _Scanner {
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this.advance();
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while (isIdentifierPart(this.peek)) this.advance();
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const str: string = this.input.substring(start, this.index);
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return KEYWORDS.indexOf(str) > -1 ? newKeywordToken(start, str) :
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newIdentifierToken(start, str);
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return KEYWORDS.indexOf(str) > -1 ? newKeywordToken(start, this.index, str) :
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newIdentifierToken(start, this.index, str);
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}
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scanNumber(start: number): Token {
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@ -275,7 +275,7 @@ class _Scanner {
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}
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const str: string = this.input.substring(start, this.index);
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const value: number = simple ? parseIntAutoRadix(str) : parseFloat(str);
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return newNumberToken(start, value);
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return newNumberToken(start, this.index, value);
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}
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scanString(): Token {
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@ -321,13 +321,14 @@ class _Scanner {
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const last: string = input.substring(marker, this.index);
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this.advance(); // Skip terminating quote.
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return newStringToken(start, buffer + last);
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return newStringToken(start, this.index, buffer + last);
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}
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error(message: string, offset: number): Token {
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const position: number = this.index + offset;
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return newErrorToken(
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position, `Lexer Error: ${message} at column ${position} in expression [${this.input}]`);
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position, this.index,
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`Lexer Error: ${message} at column ${position} in expression [${this.input}]`);
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}
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}
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@ -12,48 +12,49 @@ function lex(text: string): any[] {
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return new Lexer().tokenize(text);
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}
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function expectToken(token: any, index: number) {
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function expectToken(token: any, index: number, end: number) {
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expect(token instanceof Token).toBe(true);
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expect(token.index).toEqual(index);
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expect(token.end).toEqual(end);
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}
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function expectCharacterToken(token: any, index: number, character: string) {
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function expectCharacterToken(token: any, index: number, end: number, character: string) {
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expect(character.length).toBe(1);
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expectToken(token, index);
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expectToken(token, index, end);
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expect(token.isCharacter(character.charCodeAt(0))).toBe(true);
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}
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function expectOperatorToken(token: any, index: number, operator: string) {
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expectToken(token, index);
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function expectOperatorToken(token: any, index: number, end: number, operator: string) {
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expectToken(token, index, end);
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expect(token.isOperator(operator)).toBe(true);
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}
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function expectNumberToken(token: any, index: number, n: number) {
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expectToken(token, index);
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function expectNumberToken(token: any, index: number, end: number, n: number) {
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expectToken(token, index, end);
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expect(token.isNumber()).toBe(true);
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expect(token.toNumber()).toEqual(n);
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}
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function expectStringToken(token: any, index: number, str: string) {
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expectToken(token, index);
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function expectStringToken(token: any, index: number, end: number, str: string) {
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expectToken(token, index, end);
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expect(token.isString()).toBe(true);
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expect(token.toString()).toEqual(str);
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}
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function expectIdentifierToken(token: any, index: number, identifier: string) {
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expectToken(token, index);
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function expectIdentifierToken(token: any, index: number, end: number, identifier: string) {
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expectToken(token, index, end);
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expect(token.isIdentifier()).toBe(true);
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expect(token.toString()).toEqual(identifier);
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}
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function expectKeywordToken(token: any, index: number, keyword: string) {
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expectToken(token, index);
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function expectKeywordToken(token: any, index: number, end: number, keyword: string) {
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expectToken(token, index, end);
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expect(token.isKeyword()).toBe(true);
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expect(token.toString()).toEqual(keyword);
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}
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function expectErrorToken(token: Token, index: any, message: string) {
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expectToken(token, index);
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function expectErrorToken(token: Token, index: any, end: number, message: string) {
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expectToken(token, index, end);
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expect(token.isError()).toBe(true);
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expect(token.toString()).toEqual(message);
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}
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@ -64,88 +65,88 @@ function expectErrorToken(token: Token, index: any, message: string) {
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it('should tokenize a simple identifier', () => {
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const tokens: number[] = lex('j');
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expect(tokens.length).toEqual(1);
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expectIdentifierToken(tokens[0], 0, 'j');
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expectIdentifierToken(tokens[0], 0, 1, 'j');
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});
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it('should tokenize "this"', () => {
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const tokens: number[] = lex('this');
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expect(tokens.length).toEqual(1);
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expectKeywordToken(tokens[0], 0, 'this');
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expectKeywordToken(tokens[0], 0, 4, 'this');
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});
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it('should tokenize a dotted identifier', () => {
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const tokens: number[] = lex('j.k');
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expect(tokens.length).toEqual(3);
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expectIdentifierToken(tokens[0], 0, 'j');
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expectCharacterToken(tokens[1], 1, '.');
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expectIdentifierToken(tokens[2], 2, 'k');
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expectIdentifierToken(tokens[0], 0, 1, 'j');
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expectCharacterToken(tokens[1], 1, 2, '.');
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expectIdentifierToken(tokens[2], 2, 3, 'k');
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});
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it('should tokenize an operator', () => {
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const tokens: number[] = lex('j-k');
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expect(tokens.length).toEqual(3);
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expectOperatorToken(tokens[1], 1, '-');
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expectOperatorToken(tokens[1], 1, 2, '-');
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});
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it('should tokenize an indexed operator', () => {
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const tokens: number[] = lex('j[k]');
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expect(tokens.length).toEqual(4);
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expectCharacterToken(tokens[1], 1, '[');
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expectCharacterToken(tokens[3], 3, ']');
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expectCharacterToken(tokens[1], 1, 2, '[');
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expectCharacterToken(tokens[3], 3, 4, ']');
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});
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it('should tokenize numbers', () => {
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const tokens: number[] = lex('88');
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expect(tokens.length).toEqual(1);
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expectNumberToken(tokens[0], 0, 88);
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expectNumberToken(tokens[0], 0, 2, 88);
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});
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it('should tokenize numbers within index ops',
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() => { expectNumberToken(lex('a[22]')[2], 2, 22); });
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() => { expectNumberToken(lex('a[22]')[2], 2, 4, 22); });
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it('should tokenize simple quoted strings',
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() => { expectStringToken(lex('"a"')[0], 0, 'a'); });
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() => { expectStringToken(lex('"a"')[0], 0, 3, 'a'); });
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it('should tokenize quoted strings with escaped quotes',
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() => { expectStringToken(lex('"a\\""')[0], 0, 'a"'); });
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() => { expectStringToken(lex('"a\\""')[0], 0, 5, 'a"'); });
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it('should tokenize a string', () => {
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const tokens: Token[] = lex('j-a.bc[22]+1.3|f:\'a\\\'c\':"d\\"e"');
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expectIdentifierToken(tokens[0], 0, 'j');
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expectOperatorToken(tokens[1], 1, '-');
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expectIdentifierToken(tokens[2], 2, 'a');
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expectCharacterToken(tokens[3], 3, '.');
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expectIdentifierToken(tokens[4], 4, 'bc');
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expectCharacterToken(tokens[5], 6, '[');
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expectNumberToken(tokens[6], 7, 22);
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expectCharacterToken(tokens[7], 9, ']');
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expectOperatorToken(tokens[8], 10, '+');
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expectNumberToken(tokens[9], 11, 1.3);
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expectOperatorToken(tokens[10], 14, '|');
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expectIdentifierToken(tokens[11], 15, 'f');
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expectCharacterToken(tokens[12], 16, ':');
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expectStringToken(tokens[13], 17, 'a\'c');
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expectCharacterToken(tokens[14], 23, ':');
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expectStringToken(tokens[15], 24, 'd"e');
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expectIdentifierToken(tokens[0], 0, 1, 'j');
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expectOperatorToken(tokens[1], 1, 2, '-');
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expectIdentifierToken(tokens[2], 2, 3, 'a');
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expectCharacterToken(tokens[3], 3, 4, '.');
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expectIdentifierToken(tokens[4], 4, 6, 'bc');
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expectCharacterToken(tokens[5], 6, 7, '[');
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expectNumberToken(tokens[6], 7, 9, 22);
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expectCharacterToken(tokens[7], 9, 10, ']');
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expectOperatorToken(tokens[8], 10, 11, '+');
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expectNumberToken(tokens[9], 11, 14, 1.3);
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expectOperatorToken(tokens[10], 14, 15, '|');
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expectIdentifierToken(tokens[11], 15, 16, 'f');
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expectCharacterToken(tokens[12], 16, 17, ':');
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expectStringToken(tokens[13], 17, 23, 'a\'c');
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expectCharacterToken(tokens[14], 23, 24, ':');
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expectStringToken(tokens[15], 24, 30, 'd"e');
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});
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it('should tokenize undefined', () => {
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const tokens: Token[] = lex('undefined');
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expectKeywordToken(tokens[0], 0, 'undefined');
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expectKeywordToken(tokens[0], 0, 9, 'undefined');
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expect(tokens[0].isKeywordUndefined()).toBe(true);
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});
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it('should ignore whitespace', () => {
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const tokens: Token[] = lex('a \t \n \r b');
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expectIdentifierToken(tokens[0], 0, 'a');
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expectIdentifierToken(tokens[1], 8, 'b');
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expectIdentifierToken(tokens[0], 0, 1, 'a');
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expectIdentifierToken(tokens[1], 8, 9, 'b');
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});
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it('should tokenize quoted string', () => {
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const str = '[\'\\\'\', "\\""]';
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const tokens: Token[] = lex(str);
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expectStringToken(tokens[1], 1, '\'');
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expectStringToken(tokens[3], 7, '"');
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expectStringToken(tokens[1], 1, 5, '\'');
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expectStringToken(tokens[3], 7, 11, '"');
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});
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it('should tokenize escaped quoted string', () => {
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@ -163,86 +164,89 @@ function expectErrorToken(token: Token, index: any, message: string) {
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it('should tokenize relation', () => {
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const tokens: Token[] = lex('! == != < > <= >= === !==');
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expectOperatorToken(tokens[0], 0, '!');
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expectOperatorToken(tokens[1], 2, '==');
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expectOperatorToken(tokens[2], 5, '!=');
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expectOperatorToken(tokens[3], 8, '<');
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expectOperatorToken(tokens[4], 10, '>');
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expectOperatorToken(tokens[5], 12, '<=');
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expectOperatorToken(tokens[6], 15, '>=');
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expectOperatorToken(tokens[7], 18, '===');
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expectOperatorToken(tokens[8], 22, '!==');
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expectOperatorToken(tokens[0], 0, 1, '!');
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expectOperatorToken(tokens[1], 2, 4, '==');
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expectOperatorToken(tokens[2], 5, 7, '!=');
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expectOperatorToken(tokens[3], 8, 9, '<');
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expectOperatorToken(tokens[4], 10, 11, '>');
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expectOperatorToken(tokens[5], 12, 14, '<=');
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expectOperatorToken(tokens[6], 15, 17, '>=');
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expectOperatorToken(tokens[7], 18, 21, '===');
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expectOperatorToken(tokens[8], 22, 25, '!==');
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});
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it('should tokenize statements', () => {
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const tokens: Token[] = lex('a;b;');
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expectIdentifierToken(tokens[0], 0, 'a');
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expectCharacterToken(tokens[1], 1, ';');
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expectIdentifierToken(tokens[2], 2, 'b');
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expectCharacterToken(tokens[3], 3, ';');
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expectIdentifierToken(tokens[0], 0, 1, 'a');
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expectCharacterToken(tokens[1], 1, 2, ';');
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expectIdentifierToken(tokens[2], 2, 3, 'b');
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expectCharacterToken(tokens[3], 3, 4, ';');
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});
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it('should tokenize function invocation', () => {
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const tokens: Token[] = lex('a()');
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expectIdentifierToken(tokens[0], 0, 'a');
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expectCharacterToken(tokens[1], 1, '(');
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expectCharacterToken(tokens[2], 2, ')');
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expectIdentifierToken(tokens[0], 0, 1, 'a');
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expectCharacterToken(tokens[1], 1, 2, '(');
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expectCharacterToken(tokens[2], 2, 3, ')');
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});
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it('should tokenize simple method invocations', () => {
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const tokens: Token[] = lex('a.method()');
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expectIdentifierToken(tokens[2], 2, 'method');
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expectIdentifierToken(tokens[2], 2, 8, 'method');
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});
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it('should tokenize method invocation', () => {
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const tokens: Token[] = lex('a.b.c (d) - e.f()');
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expectIdentifierToken(tokens[0], 0, 'a');
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expectCharacterToken(tokens[1], 1, '.');
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expectIdentifierToken(tokens[2], 2, 'b');
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expectCharacterToken(tokens[3], 3, '.');
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expectIdentifierToken(tokens[4], 4, 'c');
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expectCharacterToken(tokens[5], 6, '(');
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expectIdentifierToken(tokens[6], 7, 'd');
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expectCharacterToken(tokens[7], 8, ')');
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expectOperatorToken(tokens[8], 10, '-');
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expectIdentifierToken(tokens[9], 12, 'e');
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expectCharacterToken(tokens[10], 13, '.');
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expectIdentifierToken(tokens[11], 14, 'f');
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expectCharacterToken(tokens[12], 15, '(');
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expectCharacterToken(tokens[13], 16, ')');
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expectIdentifierToken(tokens[0], 0, 1, 'a');
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expectCharacterToken(tokens[1], 1, 2, '.');
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expectIdentifierToken(tokens[2], 2, 3, 'b');
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expectCharacterToken(tokens[3], 3, 4, '.');
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expectIdentifierToken(tokens[4], 4, 5, 'c');
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expectCharacterToken(tokens[5], 6, 7, '(');
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expectIdentifierToken(tokens[6], 7, 8, 'd');
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expectCharacterToken(tokens[7], 8, 9, ')');
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expectOperatorToken(tokens[8], 10, 11, '-');
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expectIdentifierToken(tokens[9], 12, 13, 'e');
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expectCharacterToken(tokens[10], 13, 14, '.');
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expectIdentifierToken(tokens[11], 14, 15, 'f');
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||||
expectCharacterToken(tokens[12], 15, 16, '(');
|
||||
expectCharacterToken(tokens[13], 16, 17, ')');
|
||||
});
|
||||
|
||||
it('should tokenize number', () => { expectNumberToken(lex('0.5')[0], 0, 0.5); });
|
||||
it('should tokenize number', () => { expectNumberToken(lex('0.5')[0], 0, 3, 0.5); });
|
||||
|
||||
it('should tokenize number with exponent', () => {
|
||||
let tokens: Token[] = lex('0.5E-10');
|
||||
expect(tokens.length).toEqual(1);
|
||||
expectNumberToken(tokens[0], 0, 0.5E-10);
|
||||
expectNumberToken(tokens[0], 0, 7, 0.5E-10);
|
||||
tokens = lex('0.5E+10');
|
||||
expectNumberToken(tokens[0], 0, 0.5E+10);
|
||||
expectNumberToken(tokens[0], 0, 7, 0.5E+10);
|
||||
});
|
||||
|
||||
it('should return exception for invalid exponent', () => {
|
||||
expectErrorToken(
|
||||
lex('0.5E-')[0], 4, 'Lexer Error: Invalid exponent at column 4 in expression [0.5E-]');
|
||||
lex('0.5E-')[0], 4, 5,
|
||||
'Lexer Error: Invalid exponent at column 4 in expression [0.5E-]');
|
||||
|
||||
expectErrorToken(
|
||||
lex('0.5E-A')[0], 4,
|
||||
lex('0.5E-A')[0], 4, 5,
|
||||
'Lexer Error: Invalid exponent at column 4 in expression [0.5E-A]');
|
||||
});
|
||||
|
||||
it('should tokenize number starting with a dot',
|
||||
() => { expectNumberToken(lex('.5')[0], 0, 0.5); });
|
||||
() => { expectNumberToken(lex('.5')[0], 0, 2, 0.5); });
|
||||
|
||||
it('should throw error on invalid unicode', () => {
|
||||
expectErrorToken(
|
||||
lex('\'\\u1\'\'bla\'')[0], 2,
|
||||
lex('\'\\u1\'\'bla\'')[0], 2, 2,
|
||||
'Lexer Error: Invalid unicode escape [\\u1\'\'b] at column 2 in expression [\'\\u1\'\'bla\']');
|
||||
});
|
||||
|
||||
it('should tokenize hash as operator', () => { expectOperatorToken(lex('#')[0], 0, '#'); });
|
||||
it('should tokenize hash as operator',
|
||||
() => { expectOperatorToken(lex('#')[0], 0, 1, '#'); });
|
||||
|
||||
it('should tokenize ?. as operator', () => { expectOperatorToken(lex('?.')[0], 0, '?.'); });
|
||||
it('should tokenize ?. as operator',
|
||||
() => { expectOperatorToken(lex('?.')[0], 0, 2, '?.'); });
|
||||
});
|
||||
});
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue