objt-section #5
103
parser/objt.go
Normal file
103
parser/objt.go
Normal file
@ -0,0 +1,103 @@
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package parser
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import "git.tebibyte.media/sashakoshka/arf/types"
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import "git.tebibyte.media/sashakoshka/arf/lexer"
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import "git.tebibyte.media/sashakoshka/arf/infoerr"
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// parseObjtSection parses an object type definition. This allows for structured
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// types to be defined, and for member variables to be added and overridden.
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func (parser *ParsingOperation) parseObjtSection () (
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section *ObjtSection,
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err error,
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) {
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err = parser.expect(lexer.TokenKindName)
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if err != nil { return }
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section = &ObjtSection { location: parser.token.Location() }
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// get permission
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err = parser.nextToken(lexer.TokenKindPermission)
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if err != nil { return }
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section.permission = parser.token.Value().(types.Permission)
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// get name
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err = parser.nextToken(lexer.TokenKindName)
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if err != nil { return }
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section.name = parser.token.Value().(string)
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// parse inherited type
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err = parser.nextToken(lexer.TokenKindColon)
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if err != nil { return }
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err = parser.nextToken()
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if err != nil { return }
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section.inherits, err = parser.parseType()
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if err != nil { return }
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err = parser.nextToken(lexer.TokenKindNewline)
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if err != nil { return }
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// parse members
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err = parser.parseObjtMembers(section)
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if len(section.members) == 0 {
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infoerr.NewError (
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section.location,
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"defining an object with no members",
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infoerr.ErrorKindWarn).Print()
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}
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return
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}
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func (parser *ParsingOperation) parseObjtMembers (
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into *ObjtSection,
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) (
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err error,
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) {
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for {
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// if we've left the block, stop parsing
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if !parser.token.Is(lexer.TokenKindIndent) { return }
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if parser.token.Value().(int) != 1 { return }
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// get permission
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err = parser.nextToken(lexer.TokenKindPermission)
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if err != nil { return }
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member := ObjtMember { }
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member.permission = parser.token.Value().(types.Permission)
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// get name
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err = parser.nextToken(lexer.TokenKindName)
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if err != nil { return }
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member.name = parser.token.Value().(string)
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// get type
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err = parser.nextToken(lexer.TokenKindColon)
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if err != nil { return }
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err = parser.nextToken()
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if err != nil { return }
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member.what, err = parser.parseType()
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if err != nil { return }
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// parse default value
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if parser.token.Is(lexer.TokenKindNewline) {
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err = parser.nextToken()
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if err != nil { return }
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member.defaultValue,
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err = parser.parseInitializationValues(1)
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if err != nil { return }
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} else {
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member.defaultValue, err = parser.parseArgument()
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if err != nil { return }
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err = parser.expect(lexer.TokenKindNewline)
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if err != nil { return }
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err = parser.nextToken()
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if err != nil { return }
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}
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// go onto the next line
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err = parser.nextToken(lexer.TokenKindNewline)
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if err != nil { return }
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err = parser.nextToken()
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if err != nil { return }
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}
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}
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136
parser/type.go
136
parser/type.go
@ -2,9 +2,10 @@ package parser
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import "git.tebibyte.media/sashakoshka/arf/types"
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import "git.tebibyte.media/sashakoshka/arf/lexer"
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import "git.tebibyte.media/sashakoshka/arf/infoerr"
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// import "git.tebibyte.media/sashakoshka/arf/infoerr"
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// parseTypeSection parses a type definition.
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// parseTypeSection parses a blind type definition, meaning it can inherit from
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// anything including primitives, but cannot define structure.
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func (parser *ParsingOperation) parseTypeSection () (
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section *TypeSection,
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err error,
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@ -14,50 +15,33 @@ func (parser *ParsingOperation) parseTypeSection () (
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section = &TypeSection { location: parser.token.Location() }
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// parse root node
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err = parser.nextToken()
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if err != nil { return }
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section.root, err = parser.parseTypeNode(0)
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return
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}
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// parseTypeNode parses a single type definition node recursively.
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func (parser *ParsingOperation) parseTypeNode (
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baseIndent int,
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) (
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node TypeNode,
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err error,
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) {
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node.children = make(map[string] TypeNode)
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// get permission
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err = parser.expect(lexer.TokenKindPermission)
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err = parser.nextToken(lexer.TokenKindPermission)
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if err != nil { return }
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node.permission = parser.token.Value().(types.Permission)
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section.permission = parser.token.Value().(types.Permission)
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// get name
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err = parser.nextToken(lexer.TokenKindName)
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if err != nil { return }
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node.name = parser.token.Value().(string)
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section.name = parser.token.Value().(string)
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// get inherited type
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// parse inherited type
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err = parser.nextToken(lexer.TokenKindColon)
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if err != nil { return }
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err = parser.nextToken()
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if err != nil { return }
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node.what, err = parser.parseType()
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section.inherits, err = parser.parseType()
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if err != nil { return }
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// get value, or child nodes
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// parse default values
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if parser.token.Is(lexer.TokenKindNewline) {
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err = parser.nextToken()
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if err != nil { return }
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err = parser.parseTypeNodeBlock(baseIndent, &node)
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section.defaultValue, err = parser.parseInitializationValues(0)
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if err != nil { return }
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} else {
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node.defaultValue, err = parser.parseArgument()
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section.defaultValue, err = parser.parseArgument()
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if err != nil { return }
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err = parser.expect(lexer.TokenKindNewline)
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@ -67,101 +51,3 @@ func (parser *ParsingOperation) parseTypeNode (
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}
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return
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}
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// parseTypeNodeBlock starts on the line after a type node, and parses what
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// could be either an array initialization, an object initialization, or more
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// child nodes. It is similar to parseInitializationValues. If none of these
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// things were found the parser stays at the beginning of the line and the
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// method returns.
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func (parser *ParsingOperation) parseTypeNodeBlock (
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baseIndent int,
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parent *TypeNode,
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) (
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err error,
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) {
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// check if line is indented one more than baseIndent
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if !parser.token.Is(lexer.TokenKindIndent) { return }
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if parser.token.Value().(int) != baseIndent + 1 { return }
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thingLocation := parser.token.Location()
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err = parser.nextToken()
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if err != nil { return }
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if parser.token.Is(lexer.TokenKindDot) {
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// object initialization
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parser.previousToken()
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initializationArgument := Argument { location: thingLocation }
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var initializationValues ObjectInitializationValues
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initializationValues, err = parser.parseObjectInitializationValues()
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initializationArgument.kind = ArgumentKindObjectInitializationValues
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initializationArgument.value = &initializationValues
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parent.defaultValue = initializationArgument
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} else if parser.token.Is(lexer.TokenKindPermission) {
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// child members
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parser.previousToken()
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err = parser.parseTypeNodeChildren(parent)
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} else {
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// array initialization
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parser.previousToken()
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initializationArgument := Argument { location: thingLocation }
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var initializationValues ArrayInitializationValues
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initializationValues, err = parser.parseArrayInitializationValues()
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initializationArgument.kind = ArgumentKindArrayInitializationValues
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initializationArgument.value = &initializationValues
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parent.defaultValue = initializationArgument
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}
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return
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}
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// parseTypeNodeChildren parses child type nodes into a parent type node.
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func (parser *ParsingOperation) parseTypeNodeChildren (
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parent *TypeNode,
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) (
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err error,
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) {
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baseIndent := 0
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begin := true
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for {
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// if there is no indent we can just stop parsing
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if !parser.token.Is(lexer.TokenKindIndent) { break }
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indent := parser.token.Value().(int)
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if begin == true {
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baseIndent = indent
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begin = false
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}
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// do not parse any further if the indent has changed
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if indent != baseIndent { break }
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// move on to the beginning of the line, which must contain
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// a type node
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err = parser.nextToken()
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if err != nil { return }
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var child TypeNode
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child, err = parser.parseTypeNode(baseIndent)
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// if the member has already been listed, throw an error
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_, exists := parent.children[child.name]
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if exists {
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err = parser.token.NewError (
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"duplicate member \"" + child.name +
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"\" in object member initialization",
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infoerr.ErrorKindError)
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return
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}
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// store in parent
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parent.children[child.name] = child
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}
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return
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}
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Reference in New Issue
Block a user