parser

package
v0.1.0 Latest Latest
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 Go to latest Published: May 22, 2021 License: MIT Imports: 7 Imported by: 0

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Index

Constants

View Source 
const (
	ErrExpectedExpression = "ErrExpectedExpression"
	ErrExpectedStatement  = "ErrExpectedStatement"
	ErrExpectedToken      = "ErrExpectedToken"
	ErrExpectedAssignop   = "ErrExpectedAssignop"
)

Predefined constants for Error.Code

View Source 
const (
	ValidateLocalVars   = 1
	ValidateGlobalVars  = 2
	ValidateLogicalNots = 4
	ValidateFactorials  = 8
	ValidateAll         = ValidateLocalVars | ValidateGlobalVars | ValidateLogicalNots | ValidateFactorials
)

Variables

This section is empty.

Functions

func RemoveParenthesis added in v0.1.0 

func RemoveParenthesis(n ast.Node)

RemoveParenthesis removes all ()-nodes from the ast. These are superflous but were required duing parding because of bugs in starbase

Types

type Error 

type Error struct {
	// The human-readable error-message
	Message string
	// Where the error started
	StartPosition ast.Position
	// Where the error ends
	EndPosition ast.Position
	// Machine-Readable error-code
	Code string
	// A token that was expected here (optional)
	ExpectedToken *ast.Token
}

Error represents an error encountered during parsing

func Validate added in v0.1.0 

func Validate(prog ast.Node, flags int) []*Error

Validate checks the program for certain errors. Usualy this is to emulate bug's in the game's implementation

func (Error) Error 

func (e Error) Error() string

type Errors 

type Errors []*Error

Errors represents multiple Errors

func (Errors) Error 

func (e Errors) Error() string

type Parser 

type Parser struct {
	// The tokenizer used to tokenize the input
	Tokenizer    *ast.Tokenizer
	CurrentToken *ast.Token
	// using an interface of ourself to call the parsing-methods allows them to be overridden by 'subclasses'
	This YololParserFunctions
	// Contains all errors encountered during parsing
	Errors Errors
	// If true, return all found errors, not only one per line
	AllErrors bool
	// If true, print debug logs
	DebugLog bool
	// contains filtered or unexported fields
}

Parser parses a yolol programm into an AST

func (*Parser) Advance 

func (p *Parser) Advance() *ast.Token

Advance advances the current token to the next (non whitespace) token in the list

func (*Parser) Error 

func (p *Parser) Error(err *Error)

Error appends an error to the list of errors encountered during parsing if p.AllErrors is false, only the first error per line is appended to the list of errors Usually it is better to use one of the higher-level Error* methods

func (*Parser) ErrorExpectedExpression added in v0.0.24 

func (p *Parser) ErrorExpectedExpression(where string)

ErrorExpectedExpression is a shortcut to log an error about an expected expression at where

func (*Parser) ErrorExpectedStatement added in v0.0.24 

func (p *Parser) ErrorExpectedStatement(where string)

ErrorExpectedStatement is a shortcut to log an error about an expected statement at where

func (*Parser) ErrorString added in v0.0.24 

func (p *Parser) ErrorString(message string, code string)

ErrorString logs an error with the given message and type at the current location

func (*Parser) Expect 

func (p *Parser) Expect(tokenType string, tokenValue string) ast.Position

Expect checks if the current token has the given type and value if true, the tokens position is returned, otherwise an error is logged alsways advances to the next token

func (*Parser) HasNext 

func (p *Parser) HasNext() bool

HasNext returns true if there is a next token

func (*Parser) IsCurrent added in v0.0.13 

func (p *Parser) IsCurrent(t, value string) bool

IsCurrent checks if the current token matches the given type and value The comparison of the value is case-insensitive

func (*Parser) IsCurrentType added in v0.0.13 

func (p *Parser) IsCurrentType(t string) bool

IsCurrentType checks if the type of the current token is equal to the given type

func (*Parser) IsCurrentValue added in v0.0.13 

func (p *Parser) IsCurrentValue(value string) bool

IsCurrentValue checks if the value of the current token is equal to the given value The comparison is case-insensitive

func (*Parser) IsCurrentValueIn added in v0.0.13 

func (p *Parser) IsCurrentValueIn(values []string) bool

IsCurrentValueIn checks if the value of the current token is one of the provided values The comparison is case-insensitive

func (*Parser) Log 

func (p *Parser) Log()

Log logs the visiting of a parsing function

func (*Parser) LogI added in v0.0.23 

func (p *Parser) LogI(arg int)

LogI logs the visiting of a parsing function with a given argument

func (*Parser) Parse 

func (p *Parser) Parse(prog string) (*ast.Program, error)

Parse is the main method of the parser. Parses a yolol-program into an AST.

func (*Parser) ParseAssignment 

func (p *Parser) ParseAssignment() ast.Statement

ParseAssignment parses an assignment-node

func (*Parser) ParseBinaryExpression added in v0.0.23 

func (p *Parser) ParseBinaryExpression(idx int) ast.Expression

ParseBinaryExpression parses a binary expression The kind of binary-expression to be parsed is given as idx

func (*Parser) ParseBracketExpression 

func (p *Parser) ParseBracketExpression() ast.Expression

ParseBracketExpression parses a racketed expression

func (*Parser) ParseExpression 

func (p *Parser) ParseExpression() ast.Expression

ParseExpression parses an expression

func (*Parser) ParseFactorioalExpression added in v0.0.24 

func (p *Parser) ParseFactorioalExpression() ast.Expression

ParseFactorioalExpression parses a factorial

func (*Parser) ParseGoto 

func (p *Parser) ParseGoto() ast.Statement

ParseGoto parse parses a goto-node

func (*Parser) ParseIf 

func (p *Parser) ParseIf() ast.Statement

ParseIf parses an if-node

func (*Parser) ParseLine 

func (p *Parser) ParseLine() *ast.Line

ParseLine parses a line-node

func (*Parser) ParseNegationExpression added in v0.0.24 

func (p *Parser) ParseNegationExpression() ast.Expression

ParseNegationExpression parses a negation

func (*Parser) ParsePostOpExpression 

func (p *Parser) ParsePostOpExpression() ast.Expression

ParsePostOpExpression parse post-expression

func (*Parser) ParsePreOpExpression 

func (p *Parser) ParsePreOpExpression() ast.Expression

ParsePreOpExpression parse pre-expression

func (*Parser) ParsePreOrPostOperation 

func (p *Parser) ParsePreOrPostOperation() *ast.Dereference

ParsePreOrPostOperation parses a pre-/post operation (x++, ++x) as a statement

func (*Parser) ParseProgram 

func (p *Parser) ParseProgram() *ast.Program

ParseProgram parses a programm-node

func (*Parser) ParseSingleExpression 

func (p *Parser) ParseSingleExpression() ast.Expression

ParseSingleExpression parses a single expression

func (*Parser) ParseStatement 

func (p *Parser) ParseStatement() ast.Statement

ParseStatement parses a statement-node

func (*Parser) ParseUnaryExpression 

func (p *Parser) ParseUnaryExpression() ast.Expression

ParseUnaryExpression parses an unary expression

func (*Parser) ParseUnaryNotExpression added in v0.1.0 

func (p *Parser) ParseUnaryNotExpression() ast.Expression

ParseUnaryNotExpression parses a "not" expression

func (*Parser) Reset added in v0.0.10 

func (p *Parser) Reset()

Reset prepares all internal fields for a new parsing run is called automatically by Parse(). Overriding structs must call this in their Parse()

func (*Parser) SetAllErrors added in v0.0.32 

func (p *Parser) SetAllErrors(b bool)

SetAllErrors enables/disables the logging of more then one error per line

func (*Parser) SetDebugLog added in v0.0.32 

func (p *Parser) SetDebugLog(b bool)

SetDebugLog enables/disables debug-logging

func (*Parser) SkipLine 

func (p *Parser) SkipLine()

SkipLine skips tokens up to the next newline

type Printer 

type Printer struct {
	// If this functiontion is set, it is called for every AST-node, before printing anything for that node.
	// It can be used to customize printing of certain nodes or add new kinds of nodes.
	// If it returns an errior, that errors is bubbled up.
	// The function should return true, if it can handle the given node and does not want this printer to continue processing it
	PrinterExtensionFunc func(node ast.Node, visitType int, p *Printer) (bool, error)
	// If true, only insert spaces where absolutely necessary
	Mode Printermode

	// If true, at position-information to every printed token.
	// Does not produce valid yolol, but is usefull for debugging
	DebugPositions bool
	// contains filtered or unexported fields
}

Printer generates yolol-code from an AST

func (*Printer) Newline added in v0.0.14 

func (p *Printer) Newline()

Newline adds a newline to the source-code that is currently build

func (*Printer) OptionalSpace added in v0.0.14 

func (p *Printer) OptionalSpace()

OptionalSpace adds a space to the source-code that is currently build, IF we are not producing compressed output

func (*Printer) Print 

func (p *Printer) Print(prog ast.Node) (string, error)

Print returns the yolol-code the ast-node and it's children represent

func (*Printer) Space added in v0.0.14 

func (p *Printer) Space()

Space adds a space to the source-code that is currently build

func (*Printer) SpaceIfAfterIdentifier added in v0.1.0 

func (p *Printer) SpaceIfAfterIdentifier()

SpaceIfAfterIdentifier writes a space if the previously printed thing was an identifier

func (*Printer) SpaceIfFollowedByIdentifierChar added in v0.1.0 

func (p *Printer) SpaceIfFollowedByIdentifierChar()

SpaceIfFollowedByIdentifierChar adds a space, if the next character is one of the chars that are allowed inside identifiers

func (*Printer) StatementSeparator added in v0.0.14 

func (p *Printer) StatementSeparator()

StatementSeparator writes spaces to seperate statements on one line. Amount of spaces depends on settings

func (*Printer) Write added in v0.0.14 

func (p *Printer) Write(content string)

Write adds text to the source-code that is currently build

type Printermode added in v0.0.14 

type Printermode int

Printermode describes various modes for the printer 

const (
	// PrintermodeCompact inserts only spaces that are reasonably necessary
	PrintermodeCompact Printermode = 0
	// PrintermodeReadable inserts spaces the improve readability
	PrintermodeReadable Printermode = 1
)

type YololParser added in v0.0.32 

type YololParser interface {
	Parse(prog string) (*ast.Program, error)
	SetDebugLog(b bool)
	SetAllErrors(b bool)
}

YololParser is an interface that hides all overridable-methods from normal users

func NewParser 

func NewParser() YololParser

NewParser creates a new parser

type YololParserFunctions 

type YololParserFunctions interface {
	ParseStatement() ast.Statement
	ParsePreOrPostOperation() *ast.Dereference
	ParseGoto() ast.Statement
	ParseAssignment() ast.Statement
	ParseIf() ast.Statement
	ParseExpression() ast.Expression
	ParseBinaryExpression(int) ast.Expression
	ParseUnaryExpression() ast.Expression
	ParseUnaryNotExpression() ast.Expression
	ParseFactorioalExpression() ast.Expression
	ParseNegationExpression() ast.Expression
	ParseBracketExpression() ast.Expression
	ParseSingleExpression() ast.Expression
	ParsePreOpExpression() ast.Expression
	ParsePostOpExpression() ast.Expression
}

YololParserFunctions is used together with Parser.This to allow 'subclasses' to override 'virtual functions'

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