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Adding getLeadingComments and getTrailingComments methods to scanner.

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This commit is contained in:
Anders Hejlsberg 2014-08-08 16:38:27 -07:00
parent 1a4a822da6
commit be56670ddf
1 changed files with 75 additions and 0 deletions
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75
src/compiler/scanner.ts
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@ -354,6 +354,81 @@ module ts {
}
}
// Extract comments from the given source text starting at the given position. If trailing is false, whitespace is skipped until
// the first line break and comments between that location and the next token are returned. If trailing is true, comments occurring
// between the given position and the next line break are returned. The return value is an array containing a TextRange for each
// comment. Single-line comment ranges include the the beginning '//' characters but not the ending line break. Multi-line comment
// ranges include the beginning '/* and ending '*/' characters. The return value is undefined if no comments were found.
function getCommentRanges(text: string, pos: number, trailing: boolean): TextRange[] {
var result: TextRange[];
var collecting = trailing;
while (true) {
var ch = text.charCodeAt(pos);
switch (ch) {
case CharacterCodes.carriageReturn:
if (text.charCodeAt(pos + 1) === CharacterCodes.lineFeed) pos++;
case CharacterCodes.lineFeed:
pos++;
if (trailing) {
return result;
}
collecting = true;
continue;
case CharacterCodes.tab:
case CharacterCodes.verticalTab:
case CharacterCodes.formFeed:
case CharacterCodes.space:
pos++;
continue;
case CharacterCodes.slash:
var nextChar = text.charCodeAt(pos + 1);
if (nextChar === CharacterCodes.slash || nextChar === CharacterCodes.asterisk) {
var startPos = pos;
var comment: string = undefined;
pos += 2;
if (nextChar === CharacterCodes.slash) {
while (pos < text.length) {
if (isLineBreak(text.charCodeAt(pos))) {
break;
}
pos++;
}
}
else {
while (pos < text.length) {
if (text.charCodeAt(pos) === CharacterCodes.asterisk && text.charCodeAt(pos + 1) === CharacterCodes.slash) {
pos += 2;
break;
}
pos++;
}
}
if (collecting) {
if (!result) result = [];
result.push({ pos: startPos, end: pos });
}
continue;
}
break;
default:
if (ch > CharacterCodes.maxAsciiCharacter && (isWhiteSpace(ch) || isLineBreak(ch))) {
pos++;
continue;
}
break;
}
return result;
}
}
export function getLeadingComments(text: string, pos: number): TextRange[] {
return getCommentRanges(text, pos, /*trailing*/ false);
}
export function getTrailingComments(text: string, pos: number): TextRange[] {
return getCommentRanges(text, pos, /*trailing*/ true);
}
export function createScanner(languageVersion: ScriptTarget, text?: string, onError?: ErrorCallback, onComment?: CommentCallback): Scanner {
var pos: number; // Current position (end position of text of current token)
var len: number; // Length of text