func (fs LambdaStatement) Parse(block string, lineNum int, nextBlockScanner *parser.ScanPeeker, factory *StatementFactory) (Statement, parser.SyntaxError) {
lines := parser.Lines(block)
factory = fetchNewFactory(factory)
typeDef, err, rest := expressionParsing.ParseTypeDef(lines[0])
if err != nil {
return nil, parser.NewSyntaxError(err.Error(), lineNum, 0)
}
var ftd expressionParsing.FuncTypeDefinition
var ok bool
if ftd, ok = typeDef.(expressionParsing.FuncTypeDefinition); !ok {
return nil, nil
}
var codeBlock []string
if len(strings.TrimSpace(rest)) > 0 {
var first string
if len(lines) > 1 {
return nil, parser.NewSyntaxError("Inline lambdas can only be one line", lineNum, 0)
} else if first, rest = parser.Tokenize(rest); first != "->" {
return nil, parser.NewSyntaxError("Misplaced tokens: "+rest, lineNum, 0)
}
codeBlock = []string{rest}
} else {
codeBlock = parser.RemoveTabs(lines[1:])
}
innerStatements, synErr := fetchInnerStatements(codeBlock, factory, lineNum+1)
if synErr != nil {
return nil, synErr
}
synErr = verifyInnerStatements(innerStatements, lineNum)
if synErr != nil {
return nil, synErr
}
return newLambdaStatement(lineNum, ftd, innerStatements, fs.packageLevel, fs.name), nil
}
d, err := statementParser.Parse(code, 0, nil, factory)
ds := d.(*LetStatement)
Expect(err).To(BeNil())
Expect(ds).ToNot(BeNil())
Expect(ds.VariableName()).To(Equal("a"))
Expect(stripWhitespace(ds.CodeBlock())).To(Equal("b+9"))
})
It("Should return nil for a non declaration", func() {
code := "if true\n\t9\nelse\n\t10"
d, err := statementParser.Parse(code, 0, nil, factory)
Expect(err).To(BeNil())
Expect(d).To(BeNil())
})
})
Context("GenerateGo", func() {
It("Should return proper go code", func() {
code := "let a = 9 + 6"
d, err := statementParser.Parse(code, 0, nil, factory)
fm := expressionParsing.NewFunctionMap()
gocode, returnType, err := d.GenerateGo(fm)
Expect(err).To(BeNil())
intType, _, _ := expressionParsing.ParseTypeDef("int32")
Expect(returnType.GenerateGo()).To(Equal(intType.GenerateGo()))
Expect(gocode).To(Equal("var a func() int32\na = func(){\n\treturn (9+6)\n}"))
fd := fm.GetFunction("a")
Expect(fd).ToNot(BeNil())
Expect(fd.GenerateGo()).To(Equal(intType.GenerateGo()))
})
})
})
. "github.com/onsi/gomega"
)
var _ = Describe("LambdaStatement", func() {
var statementParser StatementParser
var factory *StatementFactory
BeforeEach(func() {
retParser := NewReturnStatementParser()
declParser := NewLetParser()
statementParser = NewLambdaStatementParser()
factory = NewStatementFactory(declParser, statementParser, retParser)
})
Context("Parse", func() {
var expectedType expressionParsing.TypeDefinition
BeforeEach(func() {
expectedType, _, _ = expressionParsing.ParseTypeDef("func a A -> b B -> int32")
})
It("Should distinguish a lambda statement", func() {
code := "func a A -> b B -> int32\n\t5+9"
f, err := statementParser.Parse(code, 0, nil, factory)
Expect(f).ToNot(BeNil())
fs := f.(*LambdaStatement)
Expect(err).To(BeNil())
Expect(fs).ToNot(BeNil())
Expect(fs.TypeDef.GenerateGo()).To(Equal(expectedType.GenerateGo()))
Expect(fs.InnerStatements).ToNot(BeNil())
Expect(fs.InnerStatements).To(HaveLen(1))
})
It("Should distinguish a single line lambda statement", func() {
code := "func a A -> b B -> int32 -> 5+9"
f, err := statementParser.Parse(code, 0, nil, factory)
Expect(r).ToNot(BeNil())
})
})
Context("GenerateGo", func() {
var funcMap expressionParsing.FunctionMap
BeforeEach(func() {
funcMap = expressionParsing.NewFunctionMap()
})
Context("No functions", func() {
It("Should generate the proper Go code", func() {
code := "( 1 + 11 ) - 10 / 2"
r, err := statementParser.Parse(code, 0, nil, factory)
Expect(err).To(BeNil())
genGo, returnType, err := r.GenerateGo(funcMap)
Expect(err).To(BeNil())
intType, _, _ := expressionParsing.ParseTypeDef("int32")
Expect(returnType.GenerateGo()).To(Equal(intType.GenerateGo()))
Expect(genGo).To(Equal("((1+11)-(10/2))"))
})
It("Should generate the proper Go code with proper numeric types", func() {
code := "( 1b + 11b ) - 10b / 2b"
r, err := statementParser.Parse(code, 0, nil, factory)
Expect(err).To(BeNil())
genGo, returnType, err := r.GenerateGo(funcMap)
Expect(err).To(BeNil())
intType, _, _ := expressionParsing.ParseTypeDef("int8")
Expect(returnType.GenerateGo()).To(Equal(intType.GenerateGo()))
Expect(genGo).To(Equal("((int8(1)+int8(11))-(int8(10)/int8(2)))"))
})
})
Context("With functions", func() {