Add more position conversion functions

- type LineColPosition,
- type LineColRange,
- function lineColPositionFromOffset
- function srcToLineColumnRange

And associated tests for these

remix-astwalker/package.json

@@ -32,6 +32,7 @@
     ]
   },
   "dependencies": {
+    "remix-lib": "^0.4.6",
     "@types/tape": "^4.2.33",
     "nyc": "^13.3.0",
     "tape": "^4.10.1",

remix-astwalker/src/@types/remix-lib/index.d.ts

@@ -0,0 +1,7 @@
+// Type definitiosn for the things we need from remix-lib
+
+declare module "remix-lib" {
+  export module util {
+    export function findLowerBound(target: number, array: Array<number>): number;
+  }
+}

remix-astwalker/src/sourceMappings.ts

@@ -1,30 +1,60 @@
 import { isAstNode, AstWalker } from './astWalker';
-import { AstNode, Location } from "./types";
+import { AstNode, LineColPosition, LineColRange, Location } from "./types";
+import { util } from "remix-lib";
 
 export declare interface SourceMappings {
   new(): SourceMappings;
 }
 
 /**
- * Break out fields of an AST's "src" attribute string (s:l:f)
- * into its "start", "length", and "file index" components.
+ * Turn an character offset into a "LineColPosition".
  *
- * @param {AstNode} astNode  - the object to convert.
+ * @param offset  The character offset to convert.
+ */
+export function lineColPositionFromOffset(offset: number, lineBreaks: Array<number>): LineColPosition {
+  let line: number = util.findLowerBound(offset, lineBreaks);
+  if (lineBreaks[line] !== offset) {
+    line += 1;
+  }
+  const beginColumn = line === 0 ? 0 : (lineBreaks[line - 1] + 1);
+  return <LineColPosition>{
+    line: line + 1,
+    character: (offset - beginColumn) + 1
+  }
+}
+
+/**
+ * Turn a solc AST's "src" attribute string (s:l:f)
+ * into a Location
+ *
+ * @param astNode  The object to convert.
  */
 export function sourceLocationFromAstNode(astNode: AstNode): Location | null {
   if (isAstNode(astNode) && astNode.src) {
-    var split = astNode.src.split(':')
+    return sourceLocationFromSrc(astNode.src)
+  }
+  return null;
+}
+
+/**
+ * Break out fields of solc AST's "src" attribute string (s:l:f)
+ * into its "start", "length", and "file index" components
+ * and return that as a Location
+ *
+ * @param src  A solc "src" field.
+ * @returns {Location}
+ */
+export function sourceLocationFromSrc(src: string): Location {
+  const split = src.split(':')
   return <Location>{
     start: parseInt(split[0], 10),
     length: parseInt(split[1], 10),
     file: parseInt(split[2], 10)
   }
 }
-  return null;
-}
 
 /**
- * Routines for retrieving AST object(s) using some criteria, usually
+ * Routines for retrieving solc AST object(s) using some criteria, usually
  * includng "src' information.
  */
 export class SourceMappings {
@@ -45,11 +75,10 @@ export class SourceMappings {
   };
 
   /**
-   * get a list of nodes that are at the given @arg position
+   * Get a list of nodes that are at the given "position".
    *
-   * @param {String} astNodeType - type of node to return or null
-   * @param {Int} position     - character offset
-   * @return {Object} ast object given by the compiler
+   * @param astNodeType  Type of node to return or null.
+   * @param position     Character offset where AST node should be located.
    */
   nodesAtPosition(astNodeType: string | null, position: Location, ast: AstNode): Array<AstNode> {
     const astWalker = new AstWalker()
@@ -70,6 +99,12 @@ export class SourceMappings {
     return found;
   }
 
+  /**
+   * Retrieve the first "astNodeType" that includes the source map at arg instIndex, or "null" if none found.
+   *
+   * @param astNodeType   nodeType that a found ASTNode must be. Use "null" if any ASTNode can match.
+   * @param sourceLocation "src" location that the AST node must match.
+   */
   findNodeAtSourceLocation(astNodeType: string | undefined, sourceLocation: Location, ast: AstNode | null): AstNode | null {
     const astWalker = new AstWalker()
     let found = null;
@@ -90,4 +125,25 @@ export class SourceMappings {
     astWalker.walkFull(ast, callback);
     return found;
   }
+
+  /**
+   * Retrieve the line/column range position for the given source-mapping string.
+   *
+   * @param src  Solc "src" object containing attributes {source} and {length}.
+   */
+  srcToLineColumnRange(src: string): LineColRange {
+    const sourceLocation = sourceLocationFromSrc(src);
+    if (sourceLocation.start >= 0 && sourceLocation.length >= 0) {
+      return <LineColRange>{
+        start: lineColPositionFromOffset(sourceLocation.start, this.lineBreaks),
+        end: lineColPositionFromOffset(sourceLocation.start + sourceLocation.length, this.lineBreaks)
+      }
+    } else {
+      return <LineColRange>{
+        start: null,
+        end: null
+      }
+    }
+  }
+
 }

remix-astwalker/src/types.ts

@@ -1,9 +1,27 @@
+// FIXME: should this be renamed to indicate its offset/length orientation?
+// Add "reaadonly property"?
 export interface Location {
   start: number;
   length: number;
   file: number;  // Would it be clearer to call this a file index?
 }
 
+// This is intended to be compatibile with VScode's Position.
+// However it is pretty common with other things too.
+// Note: File index is missing here
+export interface LineColPosition {
+  readonly line: number;
+  readonly character: number;
+}
+
+// This is intended to be compatibile with vscode's Range
+// However it is pretty common with other things too.
+// Note: File index is missing here
+export interface LineColRange {
+  readonly start: LineColPosition;
+  readonly end: LineColPosition;
+}
+
 export interface Node {
   ast?: AstNode;
   legacyAST?: AstNodeLegacy;

remix-astwalker/tests/resources/test.sol

@@ -0,0 +1,17 @@
+contract test {
+    int x;
+
+    int y;
+
+    function set(int _x) returns (int _r)
+    {
+        x = _x;
+        y = 10;
+        _r = x;
+    }
+
+    function get() returns (uint x, uint y)
+    {
+
+    }
+}

remix-astwalker/tests/sourceMappings.ts

@@ -1,12 +1,72 @@
 import tape from "tape";
-import { AstNode, isAstNode, SourceMappings, sourceLocationFromAstNode } from "../src";
+import {
+  AstNode, isAstNode,
+  LineColPosition, lineColPositionFromOffset,
+  LineColRange, Location,
+  SourceMappings, sourceLocationFromAstNode,
+  sourceLocationFromSrc
+} from "../src";
 import node from "./resources/newAST";
 
 tape("SourceMappings", (t: tape.Test) => {
   const source = node.source;
   const srcMappings = new SourceMappings(source);
+  t.test("SourceMappings conversions", (st: tape.Test) => {
+    st.plan(9);
+    const loc = <Location>{
+      start: 32,
+      length: 6,
+      file: 0
+    };
+
+    const ast = node.ast;
+
+    st.deepEqual(lineColPositionFromOffset(0, srcMappings.lineBreaks),
+      <LineColPosition>{ line: 1, character: 1 },
+      "lineColPositionFromOffset degenerate case");
+    st.deepEqual(lineColPositionFromOffset(200, srcMappings.lineBreaks),
+      <LineColPosition>{ line: 17, character: 1 },
+      "lineColPositionFromOffset conversion");
+
+    /* Typescript will keep us from calling sourceLocationFromAstNode
+       with the wrong type. However, for non-typescript uses, we add
+       this test which casts to an AST to check that there is a
+       run-time check in walkFull.
+    */
+    st.notOk(sourceLocationFromAstNode(<AstNode>null),
+      "sourceLocationFromAstNode rejects an invalid astNode");
+
+    st.deepEqual(sourceLocationFromAstNode(ast.nodes[0]),
+      { start: 0, length: 31, file: 0 },
+      "sourceLocationFromAstNode extracts a location");
+    st.deepEqual(sourceLocationFromSrc("32:6:0"), loc,
+      "sourceLocationFromSrc conversion");
+    const startLC = <LineColPosition>{ line: 6, character: 6 };
+    st.deepEqual(srcMappings.srcToLineColumnRange("45:96:0"),
+      <LineColRange>{
+        start: startLC,
+        end: <LineColPosition>{ line: 11, character: 6 }
+      }, "srcToLineColumnRange end of line");
+    st.deepEqual(srcMappings.srcToLineColumnRange("45:97:0"),
+      <LineColRange>{
+        start: startLC,
+        end: <LineColPosition>{ line: 12, character: 1 }
+      }, "srcToLineColumnRange beginning of next line");
+    st.deepEqual(srcMappings.srcToLineColumnRange("45:98:0"),
+      <LineColRange>{
+        start: startLC,
+        end: <LineColPosition>{ line: 13, character: 1 }
+      }, "srcToLineColumnRange skip over empty line");
+    st.deepEqual(srcMappings.srcToLineColumnRange("-1:0:0"),
+      <LineColRange>{
+        start: null,
+        end: null
+      }, "srcToLineColumnRange invalid range");
+    st.end();
+  });
+
   t.test("SourceMappings constructor", (st: tape.Test) => {
-    st.plan(2)
+    st.plan(2);
     st.equal(srcMappings.source, source, "sourceMappings object has source-code string");
     st.deepEqual(srcMappings.lineBreaks,
       [15, 26, 27, 38, 39, 81, 87, 103, 119, 135, 141, 142, 186, 192, 193, 199],
@@ -14,19 +74,9 @@ tape("SourceMappings", (t: tape.Test) => {
     st.end();
   });
   t.test("SourceMappings functions", (st: tape.Test) => {
-    // st.plan(2)
+    st.plan(5);
     const ast = node.ast;
-    st.deepEqual(sourceLocationFromAstNode(ast.nodes[0]),
-      { start: 0, length: 31, file: 0 },
-      "sourceLocationFromAstNode extracts a location");
 
-    /* Typescript will keep us from calling sourceLocationFromAstNode
-       with the wrong type. However, for non-typescript uses, we add
-       this test which casts to an AST to check that there is a
-       run-time check in walkFull.
-    */
-    st.notOk(sourceLocationFromAstNode(<AstNode>null),
-      "sourceLocationFromAstNode rejects an invalid astNode");
     const loc = { start: 267, length: 20, file: 0 };
     let astNode = srcMappings.findNodeAtSourceLocation('ExpressionStatement', loc, ast);
     st.ok(isAstNode(astNode), "findsNodeAtSourceLocation finds something");
@@ -36,7 +86,6 @@ tape("SourceMappings", (t: tape.Test) => {
     let astNodes = srcMappings.nodesAtPosition(null, loc, ast);
     st.equal(astNodes.length, 2, "nodesAtPosition should find more than one astNode");
     st.ok(isAstNode(astNodes[0]), "nodesAtPosition returns only AST nodes");
-    // console.log(astNodes[0]);
     astNodes = srcMappings.nodesAtPosition("ExpressionStatement", loc, ast);
     st.equal(astNodes.length, 1, "nodesAtPosition filtered to a single nodeType");
     st.end();

remix-astwalker/tsconfig.json

@@ -1,5 +1,6 @@
 {
   "include": ["src"],
+  "exclude":  ["node_modules", "src/@types" ],
   "compilerOptions": {
     /* Basic Options */
     "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
@@ -8,6 +9,7 @@
     "declaration": true,                      /* Generates corresponding '.d.ts' file. */
     "sourceMap": true,                        /* Generates corresponding '.map' file. */
     "outDir": "./dist",                       /* Redirect output structure to the directory. */
+
     /* Strict Type-Checking Options */
     "strict": true,                           /* Enable all strict type-checking options. */
     "noImplicitAny": false,                   /* Raise error on expressions and declarations with an implied 'any' type. */
@@ -15,7 +17,7 @@
     /* Module Resolution Options */
     "baseUrl": "./src",                       /* Base directory to resolve non-absolute module names. */
     "paths": { "remix-tests": ["./"] },       /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
-    "typeRoots": ["node_modules/@types"],                       /* List of folders to include type definitions from. */
+    "typeRoots": ["./@types", "node_modules/@types"], /* List of folders to include type definitions from. */
     "esModuleInterop": true,                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
     "types": [
       "node"