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import { advanceChar, LexerState, scanNewLine, consumeLineFeed } from './common';
import { CharTypes, CharFlags } from './charClassifier';
import { Chars } from '../chars';
import { Context, ParserState } from '../common';
import { report, Errors } from '../errors';
export const enum CommentType {
Single,
Multi,
HTMLOpen,
HTMLClose,
HashBang
}
export const CommentTypes = ['SingleLine', 'MultiLine', 'HTMLOpen', 'HTMLClose', 'HashbangComment'];
/**
* Skips hasbang (stage 3)
*
* @param parser Parser object
*/
export function skipHashBang(parser: ParserState): void {
// HashbangComment ::
// #! SingleLineCommentChars_opt
const source = parser.source;
if (parser.currentChar === Chars.Hash && source.charCodeAt(parser.index + 1) === Chars.Exclamation) {
advanceChar(parser);
advanceChar(parser);
skipSingleLineComment(
parser,
source,
LexerState.None,
CommentType.HashBang,
parser.tokenPos,
parser.linePos,
parser.colPos
);
}
}
export function skipSingleHTMLComment(
parser: ParserState,
source: string,
state: LexerState,
context: Context,
type: CommentType,
start: number,
line: number,
column: number
): LexerState {
if (context & Context.Module) report(parser, Errors.Unexpected);
return skipSingleLineComment(parser, source, state, type, start, line, column);
}
/**
* Skips single line comment
*
* @param parser Parser object
* @param state Lexer state
*/
export function skipSingleLineComment(
parser: ParserState,
source: string,
state: LexerState,
type: CommentType,
start: number,
line: number,
column: number
): LexerState {
const { index } = parser;
parser.tokenPos = parser.index;
parser.linePos = parser.line;
parser.colPos = parser.column;
while (parser.index < parser.end) {
if (CharTypes[parser.currentChar] & CharFlags.LineTerminator) {
const isCR = parser.currentChar === Chars.CarriageReturn;
scanNewLine(parser);
if (isCR && parser.index < parser.end && parser.currentChar === Chars.LineFeed)
parser.currentChar = source.charCodeAt(++parser.index);
break;
} else if ((parser.currentChar ^ Chars.LineSeparator) <= 1) {
scanNewLine(parser);
break;
}
advanceChar(parser);
parser.tokenPos = parser.index;
parser.linePos = parser.line;
parser.colPos = parser.column;
}
if (parser.onComment) {
const loc = {
start: {
line,
column
},
end: {
line: parser.linePos,
column: parser.colPos
}
};
// For Single, start before "//",
// For HTMLOpen, start before "<!--",
// For HTMLClose, start before "\n-->"
parser.onComment(CommentTypes[type & 0xff], source.slice(index, parser.tokenPos), start, parser.tokenPos, loc);
}
return state | LexerState.NewLine;
}
/**
* Skips multiline comment
*
* @param parser Parser object
* @param state Lexer state
*/
export function skipMultiLineComment(parser: ParserState, source: string, state: LexerState): LexerState | void {
const { index } = parser;
while (parser.index < parser.end) {
if (parser.currentChar < 0x2b) {
let skippedOneAsterisk = false;
while (parser.currentChar === Chars.Asterisk) {
if (!skippedOneAsterisk) {
state &= ~LexerState.LastIsCR;
skippedOneAsterisk = true;
}
if (advanceChar(parser) === Chars.Slash) {
advanceChar(parser);
if (parser.onComment) {
const loc = {
start: {
line: parser.linePos,
column: parser.colPos
},
end: {
line: parser.line,
column: parser.column
}
};
parser.onComment(
CommentTypes[CommentType.Multi & 0xff],
source.slice(index, parser.index - 2),
index - 2, // start before '/*'
parser.index, // end after '*/'
loc
);
}
parser.tokenPos = parser.index;
parser.linePos = parser.line;
parser.colPos = parser.column;
return state;
}
}
if (skippedOneAsterisk) {
continue;
}
if (CharTypes[parser.currentChar] & CharFlags.LineTerminator) {
if (parser.currentChar === Chars.CarriageReturn) {
state |= LexerState.NewLine | LexerState.LastIsCR;
scanNewLine(parser);
} else {
consumeLineFeed(parser, state);
state = (state & ~LexerState.LastIsCR) | LexerState.NewLine;
}
} else {
advanceChar(parser);
}
} else if ((parser.currentChar ^ Chars.LineSeparator) <= 1) {
state = (state & ~LexerState.LastIsCR) | LexerState.NewLine;
scanNewLine(parser);
} else {
state &= ~LexerState.LastIsCR;
advanceChar(parser);
}
}
report(parser, Errors.UnterminatedComment);
}
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