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main.go
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main.go
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package main
import (
"fmt"
"magpie/eval"
"magpie/lexer"
"magpie/parser"
"magpie/token"
"os"
)
func TestLexer() {
input := " let x = 2 + (3 * 4) / ( 5 - 3 ) + 10 - a ** 2;"
fmt.Printf("Input = %s\n", input)
l := lexer.NewLexer(input)
for {
tok := l.NextToken()
fmt.Printf("Type: %s, Literal = %s\n", tok.Type, tok.Literal)
if tok.Type == token.TOKEN_EOF {
break
}
}
}
func TestParser() {
input := " 2 + (3 * 4) / ( 5 - 3 ) + 10 + 2 ** 2 ** 3 + xyz"
expected := "((((2 + ((3 * 4) / (5 - 3))) + 10) + (2 ** (2 ** 3))) + xyz)"
l := lexer.NewLexer(input)
p := parser.NewParser(l)
program := p.ParseProgram()
if len(p.Errors()) != 0 {
for _, err := range p.Errors() {
fmt.Println(err)
}
os.Exit(1)
}
if program.String() != expected {
fmt.Printf("Syntax error: expected %s, got %s\n", expected, program.String())
os.Exit(1)
}
fmt.Printf("input = %s\n", input)
fmt.Printf("output = %s\n", program.String())
}
func TestEval() {
tests := []struct {
input string
expected string
}{
{"-1 - 2.333", "-3.333"},
{"1 + 2", "3"},
{"2 + (3 * 4) / ( 6 - 3 ) + 10", "16"},
{"2 + 3 * 4 / 6 - 3 + 10", "11"},
{"(5 + 2) * (4 - 2) + 6", "20"},
{"5 + 2 * 4 - 2 + 6", "17"},
{"5 + 2.1 * 4 - 2 + 6.2", "17.6"},
{"2 + 2 ** 2 ** 3", "258"},
{"10", "10"},
{"nil", "nil"},
{"true", "true"},
{"false", "false"},
{"let x = 2 + (3 * 4) / ( 6 - 3 ) + 10; x", "16"},
{"let x = 2 + (3 * 4) / ( 6 - 3 ) + 10; y", "error"},
{`{ let x = 10 { x } }`, "10"},
{"let x = \"hello world\"; x", "hello world"},
{`let x = "hello " + "world"; x`, "hello world"},
{"let add = fn(x,y) {x+y}; add(1,2)", "3"},
{"let add = fn(x,y) {x+y}; let sub = fn(x,y) {x-y}; add(sub(5,3), sub(4,2))", "4"},
{"len(\"Hello World\")", "11"},
{"println(10, \"Hello\")", "nil"},
{"print(10, \"Hello\")", "nil"},
{"let x = 2++; x", "2"},
{"let x = 3--; x", "3"},
{"let x = 12; let result = if x > 10 {2} else if x > 5 {3} else {4}; result", "2"},
{"let x = 10; let result = if x > 10 {2} else if x > 5 {3} else {4}; result", "3"},
{"let x = 3; let result = if x > 10 {2} else if x > 5 {3} else {4}; result", "4"},
{"let x = 8; let result = if x >= 8 {2} else if x > 5 {3} else {4}; result", "2"},
{"let x = 8; let result = if x <= 8 {2} else if x > 5 {3} else {4}; result", "2"},
{"let x = 8; let result = if x == 8 {2} else if x > 5 {3} else {4}; result", "2"},
{"let x = 8; let result = if x != 8 {2} else if x > 5 {3} else {4}; result", "3"},
{`let x = "hello"; let result = if len(x) == 5 { x }; result`, "hello"},
{"let str = \"Hello \"+\"World!\"; str", "Hello World!"},
{"let str = \"Hello \"+\"World!\"; str.upper()", "HELLO WORLD!"},
{"!-5", "false"},
{"!!!!-5", "true"},
{"!true", "false"},
{"!false", "true"},
{"!nil", "true"},
{"let arr = [1, 10.5, \"Hello\", true]; arr[0]", "1"},
{"let arr = [1, 10.5, \"Hello\", true]; arr[1]", "10.5"},
{"let arr = [1, 10.5, \"Hello\", true]; arr[2]", "Hello"},
{"let arr = [1, 10.5, \"Hello\", true]; arr[3]", "true"},
{"let arr = [1, 10.5, \"Hello\", true]; len(arr)", "4"},
{"let arr = [1, 10.5, \"Hello\", true]; arr.push(\"world\"); arr[4]", "world"},
//tuple
{"let tup = (1, 10.5, \"Hello\", true); tup[0]", "1"},
{"let tup = (1, 10.5, \"Hello\", true); tup[1]", "10.5"},
{"let tup = (1, 10.5, \"Hello\", true); tup[2]", "Hello"},
{"let tup = (1, 10.5, \"Hello\", true); tup[3]", "true"},
{"let tup = (1, 10.5, \"Hello\", true); len(tup)", "4"},
{"let tup = (1,); len(tup)", "1"},
{"let tup = (); len(tup)", "0"},
{`let tup = (1,); tup[0]=10`, "error"},
//hash
{`let myHash = {"name": "huanghaifeng", "height": 165}; println(myHash["name"], myHash["height"])`, "nil"},
//assign
{`a = "hello world"; a`, "hello world"},
{`a = "hello world"; a[2]="w"; a`, "hewlo world"},
{`arr=[1, "hello", true]; arr[0] = "good"; arr[0]`, "good"},
{`tup=(1, "hello", true); tup[0] = "good"; tup[0]`, "error"},
{`myHash={}; myHash["name"]="huanghaifeng"; myHash["name"]`, "huanghaifeng"},
//function statement & function literal
{`fn add(x,y) {return x+ y} add(2,3)`, "5"},
{`let sum = fn(x,y) {return x+ y}; sum(2,3)`, "5"},
{`let sum = fn(x,y) {return x+ y}(2,3); sum`, "5"},
//for loop
{`arr = [1, true, "Hello"]; for item in arr { println(item) } println()`, "nil"},
{`arr = [1, true, "Hello"]; for idx, item in arr { if idx == 2 { break } println(item) } println()`, "nil"},
{`hash = {"name": "huanghaifeng", "height": 165}; for k, v in hash { print(k, "=", v) println() } println()`, "nil"},
{`str = "Hello"; for c in str { println(c) } println()`, "nil"},
{`tup = (1, true, "Hello"); for item in tup { println(item) } println()`, "nil"},
{`tup = (1, true, "Hello"); for idx, item in tup { if idx == 2 { break } println(item) } println()`, "nil"},
//while
{`x = 3; while x-- > 0 { println(x) } println()`, "nil"},
{`x = 5; while x-- > 0 { println(x); if x == 2 { break } } println()`, "nil"},
{`x = 5; while x-- > 0 { if x == 4 { continue } else if x == 2 { break } println(x) } println()`, "nil"},
//do
{`x = 3; do { x--; println(x) if x == 1 { break } }; println()`, "nil"},
//multiple assignment & return-values
{`a, b, c = 1, true, "hello"; println(a) println(b) println(c)`, "nil"},
{`a, b, c = 2, false, ["x", "y", "z"]; println(a) println(b) println(c[1])`, "nil"},
{`fn math(x, y) { return x+y, x-y } add, sub = math(5,3) println(add) println(sub)`, "nil"},
{`fn xxx(x, y) { return x+y, x-y, x * y } a, _, c = xxx(5,3) println(a) println(c)`, "nil"},
}
for _, tt := range tests {
l := lexer.NewLexer(tt.input)
p := parser.NewParser(l)
program := p.ParseProgram()
if len(p.Errors()) != 0 {
for _, err := range p.Errors() {
fmt.Println(err)
}
break
}
scope := eval.NewScope(nil, os.Stdout)
evaluated := eval.Eval(program, scope)
if evaluated != nil {
if evaluated.Inspect() != tt.expected {
fmt.Printf("%s", evaluated.Inspect())
} else {
fmt.Printf("%s = %s\n", tt.input, tt.expected)
}
}
}
}
func main() {
args := os.Args[1:]
if len(args) == 1 {
if args[0] == "--lexer" {
TestLexer()
} else if args[0] == "--parser" {
TestParser()
}
os.Exit(0)
}
TestEval()
}