313 lines
8.1 KiB
Go
313 lines
8.1 KiB
Go
package parser
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import "git.tebibyte.media/sashakoshka/arf/file"
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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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// parseData parses a data section.
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func (parser *ParsingOperation) parseDataSection () (
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section *DataSection,
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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 = &DataSection { location: parser.token.Location() }
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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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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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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.what, err = parser.parseType()
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if err != nil { return }
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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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section.value, err = parser.parseInitializationValues(0)
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if err != nil { return }
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} else {
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section.value, 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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return
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}
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// parseInitializationValues starts on the line after a data section, or a set
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// phrase. It checks for an indent greater than the indent of the aforementioned
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// data section or set phrase (passed through baseIndent), and if there is,
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// it parses initialization values.
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func (parser *ParsingOperation) parseInitializationValues (
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baseIndent int,
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) (
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initializationArgument Argument,
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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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initializationArgument.location = 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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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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} else {
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// array initialization
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parser.previousToken()
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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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}
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return
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}
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// parseObjectInitializationValues parses a list of object initialization
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// values until the indentation level drops.
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func (parser *ParsingOperation) parseObjectInitializationValues () (
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initializationValues ObjectInitializationValues,
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err error,
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) {
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println("BEGIN")
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defer println("END")
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initializationValues.attributes = make(map[string] Argument)
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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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initializationValues.location = parser.token.Location()
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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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println("HIT")
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// move on to the beginning of the line, which must contain
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// a member initialization value
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err = parser.nextToken(lexer.TokenKindDot)
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if err != nil { return }
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err = parser.nextToken(lexer.TokenKindName)
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if err != nil { return }
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name := parser.token.Value().(string)
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// if the member has already been listed, throw an error
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_, exists := initializationValues.attributes[name]
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if exists {
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err = parser.token.NewError (
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"duplicate member \"" + name + "\" in object " +
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"member initialization",
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file.ErrorKindError)
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return
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}
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// parse the argument determining the member initialization
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// value
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err = parser.nextToken()
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if err != nil { return }
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var value Argument
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if parser.token.Is(lexer.TokenKindNewline) {
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// recurse
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err = parser.nextToken(lexer.TokenKindIndent)
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if err != nil { return }
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value, err = parser.parseInitializationValues(baseIndent)
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initializationValues.attributes[name] = value
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if err != nil { return }
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} else {
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// parse as normal argument
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value, err = parser.parseArgument()
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initializationValues.attributes[name] = value
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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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}
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return
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}
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// parseArrayInitializationValues parses a list of array initialization values
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// until the indentation lexel drops.
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func (parser *ParsingOperation) parseArrayInitializationValues () (
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initializationValues ArrayInitializationValues,
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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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initializationValues.location = parser.token.Location()
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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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// arguments
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err = parser.nextToken(validArgumentStartTokens...)
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if err != nil { return }
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for {
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// stop parsing this line and go on to the next if a
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// newline token is encountered
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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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break
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}
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// otherwise, parse the argument
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var argument Argument
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argument, err = parser.parseArgument()
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if err != nil { return }
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initializationValues.values = append (
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initializationValues.values,
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argument)
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}
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}
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return
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}
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// parseType parses a type notation of the form Name, {Name}, etc.
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func (parser *ParsingOperation) parseType () (what Type, err error) {
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err = parser.expect(lexer.TokenKindName, lexer.TokenKindLBrace)
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if err != nil { return }
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what.location = parser.token.Location()
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if parser.token.Is(lexer.TokenKindLBrace) {
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what.kind = TypeKindPointer
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err = parser.nextToken()
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if err != nil { return }
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var points Type
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points, err = parser.parseType()
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if err != nil { return }
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what.points = &points
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err = parser.expect (
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lexer.TokenKindUInt,
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lexer.TokenKindRBrace,
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lexer.TokenKindElipsis)
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if err != nil { return }
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if parser.token.Is(lexer.TokenKindUInt) {
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what.kind = TypeKindArray
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what.length = parser.token.Value().(uint64)
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err = parser.nextToken(lexer.TokenKindRBrace)
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if err != nil { return }
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} else if parser.token.Is(lexer.TokenKindElipsis) {
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what.kind = TypeKindArray
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err = parser.nextToken(lexer.TokenKindRBrace)
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if err != nil { return }
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}
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err = parser.nextToken()
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if err != nil { return }
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} else {
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what.name, err = parser.parseIdentifier()
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if err != nil { return }
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}
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if parser.token.Is(lexer.TokenKindColon) {
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err = parser.nextToken(lexer.TokenKindName)
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if err != nil { return }
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qualifier := parser.token.Value().(string)
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switch qualifier {
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case "mut":
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what.mutable = true
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default:
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err = parser.token.NewError (
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"unknown type qualifier \"" + qualifier + "\"",
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file.ErrorKindError)
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return
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}
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err = parser.nextToken()
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if err != nil { return }
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}
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return
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}
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// parseIdentifier parses an identifier made out of dot separated names.
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func (parser *ParsingOperation) parseIdentifier () (
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identifier Identifier,
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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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identifier.location = parser.token.Location()
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for {
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// TODO: eat up newlines and tabs after the dot, but not before
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// it.
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if !parser.token.Is(lexer.TokenKindName) { break }
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identifier.trail = append (
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identifier.trail,
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parser.token.Value().(string))
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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) { break }
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}
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return
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}
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