refactor(compiler): capture interpolation source-spans in expression …

…parser (#38747)

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 #38747

packages/compiler/src/expression_parser/parser.ts

@@ -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 {
@@ -194,28 +197,35 @@ 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,
             `at column ${this._findInterpolationErrorColumn(parts, i, interpolationConfig)} in`,
             location);
         expressions.push('$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 {