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import * as _ from 'lodash';
import * as Parser from 'solidity-parser-antlr';
import { BranchMap, FnMap, LocationByOffset, SingleFileSourceRange, StatementMap } from './types';
export interface CoverageEntriesDescription {
fnMap: FnMap;
branchMap: BranchMap;
statementMap: StatementMap;
modifiersStatementIds: number[];
}
enum BranchType {
If = 'if',
ConditionalExpression = 'cond-expr',
BinaryExpression = 'binary-expr',
}
export class ASTVisitor {
private _entryId = 0;
private readonly _fnMap: FnMap = {};
private readonly _branchMap: BranchMap = {};
private readonly _modifiersStatementIds: number[] = [];
private readonly _statementMap: StatementMap = {};
private readonly _locationByOffset: LocationByOffset;
private readonly _ignoreRangesBeginningAt: number[];
// keep track of contract/function ranges that are to be ignored
// so we can also ignore any children nodes within the contract/function
private readonly _ignoreRangesWithin: Array<[number, number]> = [];
constructor(locationByOffset: LocationByOffset, ignoreRangesBeginningAt: number[] = []) {
this._locationByOffset = locationByOffset;
this._ignoreRangesBeginningAt = ignoreRangesBeginningAt;
}
public getCollectedCoverageEntries(): CoverageEntriesDescription {
const coverageEntriesDescription = {
fnMap: this._fnMap,
branchMap: this._branchMap,
statementMap: this._statementMap,
modifiersStatementIds: this._modifiersStatementIds,
};
return coverageEntriesDescription;
}
public IfStatement(ast: Parser.IfStatement): void {
this._visitStatement(ast);
this._visitBinaryBranch(ast, ast.trueBody, ast.falseBody || ast, BranchType.If);
}
public FunctionDefinition(ast: Parser.FunctionDefinition): void {
this._visitFunctionLikeDefinition(ast);
}
public ContractDefinition(ast: Parser.ContractDefinition): void {
if (this._shouldIgnoreExpression(ast)) {
this._ignoreRangesWithin.push(ast.range as [number, number]);
}
}
public ModifierDefinition(ast: Parser.ModifierDefinition): void {
this._visitFunctionLikeDefinition(ast);
}
public ForStatement(ast: Parser.ForStatement): void {
this._visitStatement(ast);
}
public ReturnStatement(ast: Parser.ReturnStatement): void {
this._visitStatement(ast);
}
public BreakStatement(ast: Parser.BreakStatement): void {
this._visitStatement(ast);
}
public ContinueStatement(ast: Parser.ContinueStatement): void {
this._visitStatement(ast);
}
public EmitStatement(ast: any /* TODO: Parser.EmitStatement */): void {
this._visitStatement(ast);
}
public VariableDeclarationStatement(ast: Parser.VariableDeclarationStatement): void {
this._visitStatement(ast);
}
public Statement(ast: Parser.Statement): void {
this._visitStatement(ast);
}
public WhileStatement(ast: Parser.WhileStatement): void {
this._visitStatement(ast);
}
public SimpleStatement(ast: Parser.SimpleStatement): void {
this._visitStatement(ast);
}
public ThrowStatement(ast: Parser.ThrowStatement): void {
this._visitStatement(ast);
}
public DoWhileStatement(ast: Parser.DoWhileStatement): void {
this._visitStatement(ast);
}
public ExpressionStatement(ast: Parser.ExpressionStatement): void {
this._visitStatement(ast.expression);
}
public InlineAssemblyStatement(ast: Parser.InlineAssemblyStatement): void {
this._visitStatement(ast);
}
public BinaryOperation(ast: Parser.BinaryOperation): void {
const BRANCHING_BIN_OPS = ['&&', '||'];
if (_.includes(BRANCHING_BIN_OPS, ast.operator)) {
this._visitBinaryBranch(ast, ast.left, ast.right, BranchType.BinaryExpression);
}
}
public Conditional(ast: Parser.Conditional): void {
this._visitBinaryBranch(ast, ast.trueExpression, ast.falseExpression, BranchType.ConditionalExpression);
}
public ModifierInvocation(ast: Parser.ModifierInvocation): void {
const BUILTIN_MODIFIERS = ['public', 'view', 'payable', 'external', 'internal', 'pure', 'constant'];
if (!_.includes(BUILTIN_MODIFIERS, ast.name)) {
if (this._shouldIgnoreExpression(ast)) {
return;
}
this._modifiersStatementIds.push(this._entryId);
this._visitStatement(ast);
}
}
private _visitBinaryBranch(
ast: Parser.ASTNode,
left: Parser.ASTNode,
right: Parser.ASTNode,
type: BranchType,
): void {
if (this._shouldIgnoreExpression(ast)) {
return;
}
this._branchMap[this._entryId++] = {
line: this._getExpressionRange(ast).start.line,
type,
locations: [this._getExpressionRange(left), this._getExpressionRange(right)],
};
}
private _visitStatement(ast: Parser.ASTNode): void {
if (this._shouldIgnoreExpression(ast)) {
return;
}
this._statementMap[this._entryId++] = this._getExpressionRange(ast);
}
private _getExpressionRange(ast: Parser.ASTNode): SingleFileSourceRange {
const astRange = ast.range as [number, number];
const start = this._locationByOffset[astRange[0]];
const end = this._locationByOffset[astRange[1] + 1];
const range = {
start,
end,
};
return range;
}
private _shouldIgnoreExpression(ast: Parser.ASTNode): boolean {
const [astStart, astEnd] = ast.range as [number, number];
const isRangeIgnored = _.some(
this._ignoreRangesWithin,
([rangeStart, rangeEnd]: [number, number]) => astStart >= rangeStart && astEnd <= rangeEnd,
);
return this._ignoreRangesBeginningAt.includes(astStart) || isRangeIgnored;
}
private _visitFunctionLikeDefinition(ast: Parser.ModifierDefinition | Parser.FunctionDefinition): void {
if (this._shouldIgnoreExpression(ast)) {
this._ignoreRangesWithin.push(ast.range as [number, number]);
return;
}
const loc = this._getExpressionRange(ast);
this._fnMap[this._entryId++] = {
name: ast.name,
line: loc.start.line,
loc,
};
this._visitStatement(ast);
}
}
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