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refactor(compiler): capture interpolation source-spans in expression parser (#38645)

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The expression parser will split the expression up at the interpolation markers
into expressions and static strings. This commit also captures the positions of
these strings in the expression to be used in source-mapping later.

PR Close #38645
This commit is contained in:
Pete Bacon Darwin 2020-08-31 16:19:11 +01:00 committed by atscott
parent 40096bee00
commit bf31ef29f6
1 changed files with 12 additions and 2 deletions
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14
packages/compiler/src/expression_parser/parser.ts
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@ -14,7 +14,10 @@ import {AbsoluteSourceSpan, AST, AstVisitor, ASTWithSource, Binary, BindingPipe,
import {EOF, isIdentifier, isQuote, Lexer, Token, TokenType} from './lexer';
export class SplitInterpolation {
constructor(public strings: string[], public expressions: string[], public offsets: number[]) {}
constructor(
public strings: string[], public stringSpans: {start: number, end: number}[],
public expressions: string[], public expressionsSpans: {start: number, end: number}[],
public offsets: number[]) {}
}
export class TemplateBindingParseResult {
@ -194,18 +197,24 @@ export class Parser {
const strings: string[] = [];
const expressions: string[] = [];
const offsets: number[] = [];
const stringSpans: {start: number, end: number}[] = [];
const expressionSpans: {start: number, end: number}[] = [];
let offset = 0;
for (let i = 0; i < parts.length; i++) {
const part: string = parts[i];
if (i % 2 === 0) {
// fixed string
strings.push(part);
const start = offset;
offset += part.length;
stringSpans.push({start, end: offset});
} else if (part.trim().length > 0) {
const start = offset;
offset += interpolationConfig.start.length;
expressions.push(part);
offsets.push(offset);
offset += part.length + interpolationConfig.end.length;
expressionSpans.push({start, end: offset});
} else {
this._reportError(
'Blank expressions are not allowed in interpolated strings', input,
@ -213,9 +222,10 @@ export class Parser {
location);
expressions.push('$implicit');
offsets.push(offset);
expressionSpans.push({start: offset, end: offset});
}
}
return new SplitInterpolation(strings, expressions, offsets);
return new SplitInterpolation(strings, stringSpans, expressions, expressionSpans, offsets);
}
wrapLiteralPrimitive(input: string|null, location: any, absoluteOffset: number): ASTWithSource {