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parse calls, returns, and expressions

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This commit is contained in:
Chuck Smith
2024-01-18 15:06:46 -05:00
parent fee3e38896
commit 9413094bac
3 changed files with 529 additions and 223 deletions
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239
ast/ast.go
View File

@@ -3,18 +3,22 @@ package ast
import (
"bytes"
"monkey/token"
"strings"
)
// The base Node interface
type Node interface {
TokenLiteral() string
String() string
}
// All statement nodes implement this
type Statement interface {
Node
statementNode()
}
// All expression nodes implement this
type Expression interface {
Node
expressionNode()
@@ -42,67 +46,15 @@ func (p *Program) String() string {
return out.String()
}
type Identifier struct {
Token token.Token // the token.Ident token
Value string
}
// Statements
type LetStatement struct {
Token token.Token // the token.Let token
Token token.Token // the token.LET token
Name *Identifier
Value Expression
}
type ReturnStatement struct {
Token token.Token // the 'return token
ReturnValue Expression
}
type ExpressionStatement struct {
Token token.Token // the first token of the expression
Expression Expression
}
type IntegerLiteral struct {
Token token.Token
Value int64
}
type PrefixExpression struct {
Token token.Token
Operator string
Right Expression
}
type InfixExpression struct {
Token token.Token
Left Expression
Operator string
Right Expression
}
type Boolean struct {
Token token.Token
Value bool
}
type BlockStatement struct {
Token token.Token // the { token
Statements []Statement
}
type IfExpression struct {
Token token.Token // The 'if' token
Condition Expression
Consequence *BlockStatement
Alternative *BlockStatement
}
func (ls *LetStatement) statementNode() {
}
func (ls *LetStatement) TokenLiteral() string {
return ls.Token.Literal
}
func (ls *LetStatement) statementNode() {}
func (ls *LetStatement) TokenLiteral() string { return ls.Token.Literal }
func (ls *LetStatement) String() string {
var out bytes.Buffer
@@ -119,18 +71,13 @@ func (ls *LetStatement) String() string {
return out.String()
}
func (i *Identifier) expressionNode() {
type ReturnStatement struct {
Token token.Token // the 'return' token
ReturnValue Expression
}
func (i *Identifier) TokenLiteral() string {
return i.Token.Literal
}
func (i *Identifier) String() string { return i.Value }
func (rs *ReturnStatement) statementNode() {
}
func (rs *ReturnStatement) TokenLiteral() string {
return rs.Token.Literal
}
func (rs *ReturnStatement) statementNode() {}
func (rs *ReturnStatement) TokenLiteral() string { return rs.Token.Literal }
func (rs *ReturnStatement) String() string {
var out bytes.Buffer
@@ -145,32 +92,73 @@ func (rs *ReturnStatement) String() string {
return out.String()
}
func (es *ExpressionStatement) statementNode() {
}
func (es *ExpressionStatement) TokenLiteral() string {
return es.Token.Literal
type ExpressionStatement struct {
Token token.Token // the first token of the expression
Expression Expression
}
func (es *ExpressionStatement) statementNode() {}
func (es *ExpressionStatement) TokenLiteral() string { return es.Token.Literal }
func (es *ExpressionStatement) String() string {
if es.Expression != nil {
return es.Expression.String()
}
return ""
}
func (il *IntegerLiteral) expressionNode() {
type BlockStatement struct {
Token token.Token // the { token
Statements []Statement
}
func (il *IntegerLiteral) TokenLiteral() string {
return il.Token.Literal
func (bs *BlockStatement) statementNode() {}
func (bs *BlockStatement) TokenLiteral() string { return bs.Token.Literal }
func (bs *BlockStatement) String() string {
var out bytes.Buffer
for _, s := range bs.Statements {
out.WriteString(s.String())
}
func (il *IntegerLiteral) String() string {
return il.Token.Literal
return out.String()
}
// Expressions
type Identifier struct {
Token token.Token // the token.IDENT token
Value string
}
func (i *Identifier) expressionNode() {}
func (i *Identifier) TokenLiteral() string { return i.Token.Literal }
func (i *Identifier) String() string { return i.Value }
type Boolean struct {
Token token.Token
Value bool
}
func (b *Boolean) expressionNode() {}
func (b *Boolean) TokenLiteral() string { return b.Token.Literal }
func (b *Boolean) String() string { return b.Token.Literal }
type IntegerLiteral struct {
Token token.Token
Value int64
}
func (il *IntegerLiteral) expressionNode() {}
func (il *IntegerLiteral) TokenLiteral() string { return il.Token.Literal }
func (il *IntegerLiteral) String() string { return il.Token.Literal }
type PrefixExpression struct {
Token token.Token // The prefix token, e.g. !
Operator string
Right Expression
}
func (pe *PrefixExpression) expressionNode() {}
func (pe *PrefixExpression) TokenLiteral() string {
return pe.Token.Literal
}
func (pe *PrefixExpression) TokenLiteral() string { return pe.Token.Literal }
func (pe *PrefixExpression) String() string {
var out bytes.Buffer
@@ -182,10 +170,15 @@ func (pe *PrefixExpression) String() string {
return out.String()
}
func (ie *InfixExpression) expressionNode() {}
func (ie *InfixExpression) TokenLiteral() string {
return ie.Token.Literal
type InfixExpression struct {
Token token.Token // The operator token, e.g. +
Left Expression
Operator string
Right Expression
}
func (ie *InfixExpression) expressionNode() {}
func (ie *InfixExpression) TokenLiteral() string { return ie.Token.Literal }
func (ie *InfixExpression) String() string {
var out bytes.Buffer
@@ -198,32 +191,16 @@ func (ie *InfixExpression) String() string {
return out.String()
}
func (b Boolean) TokenLiteral() string {
return b.Token.Literal
}
func (b Boolean) String() string {
return b.Token.Literal
}
func (b Boolean) expressionNode() {}
func (bs BlockStatement) TokenLiteral() string {
return bs.Token.Literal
}
func (bs BlockStatement) String() string {
var out bytes.Buffer
for _, s := range bs.Statements {
out.WriteString(s.String())
type IfExpression struct {
Token token.Token // The 'if' token
Condition Expression
Consequence *BlockStatement
Alternative *BlockStatement
}
return out.String()
}
func (bs BlockStatement) statementNode() {}
func (ie IfExpression) TokenLiteral() string {
return ie.Token.Literal
}
func (ie IfExpression) String() string {
func (ie *IfExpression) expressionNode() {}
func (ie *IfExpression) TokenLiteral() string { return ie.Token.Literal }
func (ie *IfExpression) String() string {
var out bytes.Buffer
out.WriteString("if")
@@ -238,4 +215,52 @@ func (ie IfExpression) String() string {
return out.String()
}
func (ie IfExpression) expressionNode() {}
type FunctionLiteral struct {
Token token.Token // The 'fn' token
Parameters []*Identifier
Body *BlockStatement
}
func (fl *FunctionLiteral) expressionNode() {}
func (fl *FunctionLiteral) TokenLiteral() string { return fl.Token.Literal }
func (fl *FunctionLiteral) String() string {
var out bytes.Buffer
params := []string{}
for _, p := range fl.Parameters {
params = append(params, p.String())
}
out.WriteString(fl.TokenLiteral())
out.WriteString("(")
out.WriteString(strings.Join(params, ", "))
out.WriteString(") ")
out.WriteString(fl.Body.String())
return out.String()
}
type CallExpression struct {
Token token.Token // The '(' token
Function Expression // Identifier or FunctionLiteral
Arguments []Expression
}
func (ce *CallExpression) expressionNode() {}
func (ce *CallExpression) TokenLiteral() string { return ce.Token.Literal }
func (ce *CallExpression) String() string {
var out bytes.Buffer
args := []string{}
for _, a := range ce.Arguments {
args = append(args, a.String())
}
out.WriteString(ce.Function.String())
out.WriteString("(")
out.WriteString(strings.Join(args, ", "))
out.WriteString(")")
return out.String()
}

261
parser/parser.go
View File

@@ -17,6 +17,7 @@ const (
PRODUCT // *
PREFIX // -X or !X
CALL // myFunction(X)
INDEX // array[index]
)
var precedences = map[token.TokenType]int{
@@ -28,8 +29,14 @@ var precedences = map[token.TokenType]int{
token.MINUS: SUM,
token.SLASH: PRODUCT,
token.ASTERISK: PRODUCT,
token.LPAREN: CALL,
}
type (
prefixParseFn func() ast.Expression
infixParseFn func(ast.Expression) ast.Expression
)
type Parser struct {
l *lexer.Lexer
errors []string
@@ -41,16 +48,6 @@ type Parser struct {
infixParseFns map[token.TokenType]infixParseFn
}
type (
prefixParseFn func() ast.Expression
infixParseFn func(expression ast.Expression) ast.Expression
)
func (p *Parser) nextToken() {
p.curToken = p.peekToken
p.peekToken = p.l.NextToken()
}
func New(l *lexer.Lexer) *Parser {
p := &Parser{
l: l,
@@ -66,6 +63,7 @@ func New(l *lexer.Lexer) *Parser {
p.registerPrefix(token.FALSE, p.parseBoolean)
p.registerPrefix(token.LPAREN, p.parseGroupedExpression)
p.registerPrefix(token.IF, p.parseIfExpression)
p.registerPrefix(token.FUNCTION, p.parseFunctionLiteral)
p.infixParseFns = make(map[token.TokenType]infixParseFn)
p.registerInfix(token.PLUS, p.parseInfixExpression)
@@ -77,13 +75,53 @@ func New(l *lexer.Lexer) *Parser {
p.registerInfix(token.LT, p.parseInfixExpression)
p.registerInfix(token.GT, p.parseInfixExpression)
// Read two token, so curToken and peekToken are both set
p.registerInfix(token.LPAREN, p.parseCallExpression)
// Read two tokens, so curToken and peekToken are both set
p.nextToken()
p.nextToken()
return p
}
func (p *Parser) nextToken() {
p.curToken = p.peekToken
p.peekToken = p.l.NextToken()
}
func (p *Parser) curTokenIs(t token.TokenType) bool {
return p.curToken.Type == t
}
func (p *Parser) peekTokenIs(t token.TokenType) bool {
return p.peekToken.Type == t
}
func (p *Parser) expectPeek(t token.TokenType) bool {
if p.peekTokenIs(t) {
p.nextToken()
return true
} else {
p.peekError(t)
return false
}
}
func (p *Parser) Errors() []string {
return p.errors
}
func (p *Parser) peekError(t token.TokenType) {
msg := fmt.Sprintf("expected next token to be %s, got %s instead",
t, p.peekToken.Type)
p.errors = append(p.errors, msg)
}
func (p *Parser) noPrefixParseFnError(t token.TokenType) {
msg := fmt.Sprintf("no prefix parse function for %s found", t)
p.errors = append(p.errors, msg)
}
func (p *Parser) ParseProgram() *ast.Program {
program := &ast.Program{}
program.Statements = []ast.Statement{}
@@ -106,7 +144,7 @@ func (p *Parser) parseStatement() ast.Statement {
case token.RETURN:
return p.parseReturnStatement()
default:
return p.parseExpressionsStatement()
return p.parseExpressionStatement()
}
}
@@ -117,65 +155,38 @@ func (p *Parser) parseLetStatement() *ast.LetStatement {
return nil
}
stmt.Name = &ast.Identifier{
Token: p.curToken,
Value: p.curToken.Literal,
}
stmt.Name = &ast.Identifier{Token: p.curToken, Value: p.curToken.Literal}
if !p.expectPeek(token.ASSIGN) {
return nil
}
// TODO: We're skipping expressions until we
// encounter a semicolon
for !p.curTokenIs(token.SEMICOLON) {
p.nextToken()
stmt.Value = p.parseExpression(LOWEST)
if p.peekTokenIs(token.SEMICOLON) {
p.nextToken()
}
return stmt
}
func (p *Parser) expectPeek(t token.TokenType) bool {
if p.peekTokenIs(t) {
p.nextToken()
return true
} else {
p.peekError(t)
return false
}
}
func (p *Parser) curTokenIs(t token.TokenType) bool {
return p.curToken.Type == t
}
func (p *Parser) peekTokenIs(t token.TokenType) bool {
return p.peekToken.Type == t
}
func (p *Parser) Errors() []string {
return p.errors
}
func (p *Parser) peekError(t token.TokenType) {
msg := fmt.Sprintf("expected next token to be %s, got %s instead", t, p.peekToken.Type)
p.errors = append(p.errors, msg)
}
func (p *Parser) parseReturnStatement() *ast.ReturnStatement {
stmt := &ast.ReturnStatement{Token: p.curToken}
p.nextToken()
// TODO: We're skipping the expression until we encounter a semicolon
for !p.curTokenIs(token.SEMICOLON) {
stmt.ReturnValue = p.parseExpression(LOWEST)
if p.peekTokenIs(token.SEMICOLON) {
p.nextToken()
}
return stmt
}
func (p *Parser) parseExpressionsStatement() *ast.ExpressionStatement {
func (p *Parser) parseExpressionStatement() *ast.ExpressionStatement {
stmt := &ast.ExpressionStatement{Token: p.curToken}
stmt.Expression = p.parseExpression(LOWEST)
@@ -209,6 +220,26 @@ func (p *Parser) parseExpression(precedence int) ast.Expression {
return leftExp
}
func (p *Parser) peekPrecedence() int {
if p, ok := precedences[p.peekToken.Type]; ok {
return p
}
return LOWEST
}
func (p *Parser) curPrecedence() int {
if p, ok := precedences[p.curToken.Type]; ok {
return p
}
return LOWEST
}
func (p *Parser) parseIdentifier() ast.Expression {
return &ast.Identifier{Token: p.curToken, Value: p.curToken.Literal}
}
func (p *Parser) parseIntegerLiteral() ast.Expression {
lit := &ast.IntegerLiteral{Token: p.curToken}
@@ -224,26 +255,6 @@ func (p *Parser) parseIntegerLiteral() ast.Expression {
return lit
}
func (p *Parser) registerPrefix(tokenType token.TokenType, fn prefixParseFn) {
p.prefixParseFns[tokenType] = fn
}
func (p *Parser) registerInfix(tokenType token.TokenType, fn infixParseFn) {
p.infixParseFns[tokenType] = fn
}
func (p *Parser) parseIdentifier() ast.Expression {
return &ast.Identifier{
Token: p.curToken,
Value: p.curToken.Literal,
}
}
func (p *Parser) noPrefixParseFnError(t token.TokenType) {
msg := fmt.Sprintf("no prefix parse function for %s found", t)
p.errors = append(p.errors, msg)
}
func (p *Parser) parsePrefixExpression() ast.Expression {
expression := &ast.PrefixExpression{
Token: p.curToken,
@@ -257,22 +268,6 @@ func (p *Parser) parsePrefixExpression() ast.Expression {
return expression
}
func (p *Parser) peekPrecedence() int {
if p, ok := precedences[p.peekToken.Type]; ok {
return p
}
return LOWEST
}
func (p *Parser) curPrecedence() int {
if p, ok := precedences[p.curToken.Type]; ok {
return p
}
return LOWEST
}
func (p *Parser) parseInfixExpression(left ast.Expression) ast.Expression {
expression := &ast.InfixExpression{
Token: p.curToken,
@@ -288,10 +283,7 @@ func (p *Parser) parseInfixExpression(left ast.Expression) ast.Expression {
}
func (p *Parser) parseBoolean() ast.Expression {
return &ast.Boolean{
Token: p.curToken,
Value: p.curTokenIs(token.TRUE),
}
return &ast.Boolean{Token: p.curToken, Value: p.curTokenIs(token.TRUE)}
}
func (p *Parser) parseGroupedExpression() ast.Expression {
@@ -299,7 +291,7 @@ func (p *Parser) parseGroupedExpression() ast.Expression {
exp := p.parseExpression(LOWEST)
if p.expectPeek(token.RPAREN) {
if !p.expectPeek(token.RPAREN) {
return nil
}
@@ -324,7 +316,7 @@ func (p *Parser) parseIfExpression() ast.Expression {
return nil
}
expression.Consequence = p.parseBlockExpression()
expression.Consequence = p.parseBlockStatement()
if p.peekTokenIs(token.ELSE) {
p.nextToken()
@@ -333,13 +325,13 @@ func (p *Parser) parseIfExpression() ast.Expression {
return nil
}
expression.Alternative = p.parseBlockExpression()
expression.Alternative = p.parseBlockStatement()
}
return expression
}
func (p *Parser) parseBlockExpression() *ast.BlockStatement {
func (p *Parser) parseBlockStatement() *ast.BlockStatement {
block := &ast.BlockStatement{Token: p.curToken}
block.Statements = []ast.Statement{}
@@ -355,3 +347,86 @@ func (p *Parser) parseBlockExpression() *ast.BlockStatement {
return block
}
func (p *Parser) parseFunctionLiteral() ast.Expression {
lit := &ast.FunctionLiteral{Token: p.curToken}
if !p.expectPeek(token.LPAREN) {
return nil
}
lit.Parameters = p.parseFunctionParameters()
if !p.expectPeek(token.LBRACE) {
return nil
}
lit.Body = p.parseBlockStatement()
return lit
}
func (p *Parser) parseFunctionParameters() []*ast.Identifier {
identifiers := []*ast.Identifier{}
if p.peekTokenIs(token.RPAREN) {
p.nextToken()
return identifiers
}
p.nextToken()
ident := &ast.Identifier{Token: p.curToken, Value: p.curToken.Literal}
identifiers = append(identifiers, ident)
for p.peekTokenIs(token.COMMA) {
p.nextToken()
p.nextToken()
ident := &ast.Identifier{Token: p.curToken, Value: p.curToken.Literal}
identifiers = append(identifiers, ident)
}
if !p.expectPeek(token.RPAREN) {
return nil
}
return identifiers
}
func (p *Parser) parseCallExpression(function ast.Expression) ast.Expression {
exp := &ast.CallExpression{Token: p.curToken, Function: function}
exp.Arguments = p.parseExpressionList(token.RPAREN)
return exp
}
func (p *Parser) parseExpressionList(end token.TokenType) []ast.Expression {
list := []ast.Expression{}
if p.peekTokenIs(end) {
p.nextToken()
return list
}
p.nextToken()
list = append(list, p.parseExpression(LOWEST))
for p.peekTokenIs(token.COMMA) {
p.nextToken()
p.nextToken()
list = append(list, p.parseExpression(LOWEST))
}
if !p.expectPeek(end) {
return nil
}
return list
}
func (p *Parser) registerPrefix(tokenType token.TokenType, fn prefixParseFn) {
p.prefixParseFns[tokenType] = fn
}
func (p *Parser) registerInfix(tokenType token.TokenType, fn infixParseFn) {
p.infixParseFns[tokenType] = fn
}

248
parser/parser_test.go
View File

@@ -356,6 +356,43 @@ func TestOperatorPrecedenceParsing(t *testing.T) {
}
}
func TestBooleanExpression(t *testing.T) {
tests := []struct {
input string
expectedBoolean bool
}{
{"true;", true},
{"false;", false},
}
for _, tt := range tests {
l := lexer.New(tt.input)
p := New(l)
program := p.ParseProgram()
checkParserErrors(t, p)
if len(program.Statements) != 1 {
t.Fatalf("program has not enough statements. got=%d",
len(program.Statements))
}
stmt, ok := program.Statements[0].(*ast.ExpressionStatement)
if !ok {
t.Fatalf("program.Statements[0] is not ast.ExpressionStatement. got=%T",
program.Statements[0])
}
boolean, ok := stmt.Expression.(*ast.Boolean)
if !ok {
t.Fatalf("exp not *ast.Boolean. got=%T", stmt.Expression)
}
if boolean.Value != tt.expectedBoolean {
t.Errorf("boolean.Value not %t. got=%t", tt.expectedBoolean,
boolean.Value)
}
}
}
func TestIfExpression(t *testing.T) {
input := `if (x < y) { x }`
@@ -464,6 +501,175 @@ func TestIfElseExpression(t *testing.T) {
}
}
func TestFunctionLiteralParsing(t *testing.T) {
input := `fn(x, y) { x + y; }`
l := lexer.New(input)
p := New(l)
program := p.ParseProgram()
checkParserErrors(t, p)
if len(program.Statements) != 1 {
t.Fatalf("program.Statements does not contain %d statements. got=%d\n",
1, len(program.Statements))
}
stmt, ok := program.Statements[0].(*ast.ExpressionStatement)
if !ok {
t.Fatalf("program.Statements[0] is not ast.ExpressionStatement. got=%T",
program.Statements[0])
}
function, ok := stmt.Expression.(*ast.FunctionLiteral)
if !ok {
t.Fatalf("stmt.Expression is not ast.FunctionLiteral. got=%T",
stmt.Expression)
}
if len(function.Parameters) != 2 {
t.Fatalf("function literal parameters wrong. want 2, got=%d\n",
len(function.Parameters))
}
testLiteralExpression(t, function.Parameters[0], "x")
testLiteralExpression(t, function.Parameters[1], "y")
if len(function.Body.Statements) != 1 {
t.Fatalf("function.Body.Statements has not 1 statements. got=%d\n",
len(function.Body.Statements))
}
bodyStmt, ok := function.Body.Statements[0].(*ast.ExpressionStatement)
if !ok {
t.Fatalf("function body stmt is not ast.ExpressionStatement. got=%T",
function.Body.Statements[0])
}
testInfixExpression(t, bodyStmt.Expression, "x", "+", "y")
}
func TestFunctionParameterParsing(t *testing.T) {
tests := []struct {
input string
expectedParams []string
}{
{input: "fn() {};", expectedParams: []string{}},
{input: "fn(x) {};", expectedParams: []string{"x"}},
{input: "fn(x, y, z) {};", expectedParams: []string{"x", "y", "z"}},
}
for _, tt := range tests {
l := lexer.New(tt.input)
p := New(l)
program := p.ParseProgram()
checkParserErrors(t, p)
stmt := program.Statements[0].(*ast.ExpressionStatement)
function := stmt.Expression.(*ast.FunctionLiteral)
if len(function.Parameters) != len(tt.expectedParams) {
t.Errorf("length parameters wrong. want %d, got=%d\n",
len(tt.expectedParams), len(function.Parameters))
}
for i, ident := range tt.expectedParams {
testLiteralExpression(t, function.Parameters[i], ident)
}
}
}
func TestCallExpressionParsing(t *testing.T) {
input := "add(1, 2 * 3, 4 + 5);"
l := lexer.New(input)
p := New(l)
program := p.ParseProgram()
checkParserErrors(t, p)
if len(program.Statements) != 1 {
t.Fatalf("program.Statements does not contain %d statements. got=%d\n",
1, len(program.Statements))
}
stmt, ok := program.Statements[0].(*ast.ExpressionStatement)
if !ok {
t.Fatalf("stmt is not ast.ExpressionStatement. got=%T",
program.Statements[0])
}
exp, ok := stmt.Expression.(*ast.CallExpression)
if !ok {
t.Fatalf("stmt.Expression is not ast.CallExpression. got=%T",
stmt.Expression)
}
if !testIdentifier(t, exp.Function, "add") {
return
}
if len(exp.Arguments) != 3 {
t.Fatalf("wrong length of arguments. got=%d", len(exp.Arguments))
}
testLiteralExpression(t, exp.Arguments[0], 1)
testInfixExpression(t, exp.Arguments[1], 2, "*", 3)
testInfixExpression(t, exp.Arguments[2], 4, "+", 5)
}
func TestCallExpressionParameterParsing(t *testing.T) {
tests := []struct {
input string
expectedIdent string
expectedArgs []string
}{
{
input: "add();",
expectedIdent: "add",
expectedArgs: []string{},
},
{
input: "add(1);",
expectedIdent: "add",
expectedArgs: []string{"1"},
},
{
input: "add(1, 2 * 3, 4 + 5);",
expectedIdent: "add",
expectedArgs: []string{"1", "(2 * 3)", "(4 + 5)"},
},
}
for _, tt := range tests {
l := lexer.New(tt.input)
p := New(l)
program := p.ParseProgram()
checkParserErrors(t, p)
stmt := program.Statements[0].(*ast.ExpressionStatement)
exp, ok := stmt.Expression.(*ast.CallExpression)
if !ok {
t.Fatalf("stmt.Expression is not ast.CallExpression. got=%T",
stmt.Expression)
}
if !testIdentifier(t, exp.Function, tt.expectedIdent) {
return
}
if len(exp.Arguments) != len(tt.expectedArgs) {
t.Fatalf("wrong number of arguments. want=%d, got=%d",
len(tt.expectedArgs), len(exp.Arguments))
}
for i, arg := range tt.expectedArgs {
if exp.Arguments[i].String() != arg {
t.Errorf("argument %d wrong. want=%q, got=%q", i,
arg, exp.Arguments[i].String())
}
}
}
}
func testLetStatement(t *testing.T, s ast.Statement, name string) bool {
if s.TokenLiteral() != "let" {
t.Errorf("s.TokenLiteral not 'let'. got=%q", s.TokenLiteral())
@@ -534,27 +740,6 @@ func testLiteralExpression(
return false
}
func testBooleanLiteral(t *testing.T, exp ast.Expression, value bool) bool {
bo, ok := exp.(*ast.Boolean)
if !ok {
t.Errorf("exp *ast.Boolean. got=%T", exp)
return false
}
if bo.Value != value {
t.Errorf("bo.Value not %t. got=%t", value, bo.Value)
return false
}
if bo.TokenLiteral() != fmt.Sprintf("%t", value) {
t.Errorf("intboeg.TokenLiteral not %t. got=%s", value,
bo.TokenLiteral())
return false
}
return true
}
func testIntegerLiteral(t *testing.T, il ast.Expression, value int64) bool {
integ, ok := il.(*ast.IntegerLiteral)
if !ok {
@@ -597,6 +782,27 @@ func testIdentifier(t *testing.T, exp ast.Expression, value string) bool {
return true
}
func testBooleanLiteral(t *testing.T, exp ast.Expression, value bool) bool {
bo, ok := exp.(*ast.Boolean)
if !ok {
t.Errorf("exp not *ast.Boolean. got=%T", exp)
return false
}
if bo.Value != value {
t.Errorf("bo.Value not %t. got=%t", value, bo.Value)
return false
}
if bo.TokenLiteral() != fmt.Sprintf("%t", value) {
t.Errorf("bo.TokenLiteral not %t. got=%s",
value, bo.TokenLiteral())
return false
}
return true
}
func checkParserErrors(t *testing.T, p *Parser) {
errors := p.Errors()
if len(errors) == 0 {