postscript

package
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 Go to latest Published: Mar 31, 2015 License: BSD-2-Clause Imports: 12 Imported by: 0

Documentation

Overview

Graphics operators

Arithmetic and Math Operators

Miscellaneous Operators

Operand Stack Manipulation Operators

Copyright 2009 The Go Authors. All rights reserved. Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. postscript scanner derived form the scanner package of go sources

Index

Constants

View Source 
const (
	ScanIdents     = 1 << -Ident
	ScanInts       = 1 << -Int
	ScanFloats     = 1 << -Float // includes Ints
	ScanChars      = 1 << -Char
	ScanStrings    = 1 << -String
	ScanRawStrings = 1 << -RawString
	ScanComments   = 1 << -Comment
	SkipComments   = 1 << -skipComment // if set with ScanComments, comments become white space
	GoTokens       = ScanIdents | ScanFloats | ScanChars | ScanStrings | ScanRawStrings | ScanComments | SkipComments
)

Predefined mode bits to control recognition of tokens. For instance, to configure a Scanner such that it only recognizes (Go) identifiers, integers, and skips comments, set the Scanner's Mode field to: 

ScanIdents | ScanInts | SkipComments
View Source 
const (
	EOF = -(iota + 1)
	Ident
	Int
	Float
	Char
	String
	RawString
	Comment
)

The result of Scan is one of the following tokens or a Unicode character.

View Source 
const GoWhitespace = 1<<'\t' | 1<<'\n' | 1<<'\r' | 1<<' '

GoWhitespace is the default value for the Scanner's Whitespace field. Its value selects Go's white space characters.

Variables

This section is empty.

Functions

func TokenString 

func TokenString(tok int) string

TokenString returns a (visible) string for a token or Unicode character.

Types

type Dictionary 

type Dictionary map[string]Value

func NewDictionary 

func NewDictionary(prealloc int) Dictionary

type DictionaryStack 

type DictionaryStack []Dictionary

type Interpreter 

type Interpreter struct {
	// contains filtered or unexported fields
}

func NewInterpreter 

func NewInterpreter(gc draw2d.GraphicContext) *Interpreter

func (*Interpreter) ClearDictionaries 

func (interpreter *Interpreter) ClearDictionaries()

func (*Interpreter) ClearOperands 

func (interpreter *Interpreter) ClearOperands()

func (*Interpreter) Define 

func (interpreter *Interpreter) Define(name string, value Value)

func (*Interpreter) DictionaryStackSize 

func (interpreter *Interpreter) DictionaryStackSize() int

func (*Interpreter) Execute 

func (interpreter *Interpreter) Execute(reader io.Reader)

func (*Interpreter) ExecuteFile 

func (interpreter *Interpreter) ExecuteFile(filePath string) error

func (*Interpreter) FindValue 

func (interpreter *Interpreter) FindValue(name string) Value

func (*Interpreter) FindValueInDictionaries 

func (interpreter *Interpreter) FindValueInDictionaries(name string) (Value, Dictionary)

func (*Interpreter) Get 

func (interpreter *Interpreter) Get(index int) Value

func (*Interpreter) GetGraphicContext 

func (interpreter *Interpreter) GetGraphicContext() draw2d.GraphicContext

func (*Interpreter) GetValues 

func (interpreter *Interpreter) GetValues(n int) []Value

func (*Interpreter) OperandSize 

func (interpreter *Interpreter) OperandSize() int

func (*Interpreter) Peek 

func (interpreter *Interpreter) Peek() Value

func (*Interpreter) PeekDictionary 

func (interpreter *Interpreter) PeekDictionary() Dictionary

func (*Interpreter) Pop 

func (interpreter *Interpreter) Pop() Value

func (*Interpreter) PopArray 

func (interpreter *Interpreter) PopArray() []Value

func (*Interpreter) PopBoolean 

func (interpreter *Interpreter) PopBoolean() bool

func (*Interpreter) PopDictionary 

func (interpreter *Interpreter) PopDictionary() Dictionary

func (*Interpreter) PopFloat 

func (interpreter *Interpreter) PopFloat() float64

func (*Interpreter) PopInt 

func (interpreter *Interpreter) PopInt() int

func (*Interpreter) PopName 

func (interpreter *Interpreter) PopName() string

func (*Interpreter) PopOperator 

func (interpreter *Interpreter) PopOperator() Operator

func (*Interpreter) PopProcedureDefinition 

func (interpreter *Interpreter) PopProcedureDefinition() *ProcedureDefinition

func (*Interpreter) PopString 

func (interpreter *Interpreter) PopString() string

func (*Interpreter) PopValues 

func (interpreter *Interpreter) PopValues(n int) []Value

func (*Interpreter) Push 

func (interpreter *Interpreter) Push(operand Value)

func (*Interpreter) PushDictionary 

func (interpreter *Interpreter) PushDictionary(dictionary Dictionary)

func (*Interpreter) SetGraphicContext 

func (interpreter *Interpreter) SetGraphicContext(gc draw2d.GraphicContext)

func (*Interpreter) SystemDefine 

func (interpreter *Interpreter) SystemDefine(name string, value Value)

func (*Interpreter) SystemDictionary 

func (interpreter *Interpreter) SystemDictionary() Dictionary

func (*Interpreter) UserDictionary 

func (interpreter *Interpreter) UserDictionary() Dictionary

type Mark 

type Mark struct{}

Mark

type Operator 

type Operator interface {
	Execute(interpreter *Interpreter)
}

type OperatorFunc 

type OperatorFunc func(interpreter *Interpreter)

type Position 

type Position struct {
	Filename string // filename, if any
	Offset   int    // byte offset, starting at 0
	Line     int    // line number, starting at 1
	Column   int    // column number, starting at 0 (character count per line)
}

A source position is represented by a Position value. A position is valid if Line > 0.

func (*Position) IsValid 

func (pos *Position) IsValid() bool

IsValid returns true if the position is valid.

func (Position) String 

func (pos Position) String() string

type PrimitiveOperator 

type PrimitiveOperator struct {
	// contains filtered or unexported fields
}

func NewOperator 

func NewOperator(f OperatorFunc) *PrimitiveOperator

func (*PrimitiveOperator) Execute 

func (o *PrimitiveOperator) Execute(interpreter *Interpreter)

type Procedure 

type Procedure struct {
	// contains filtered or unexported fields
}

func NewProcedure 

func NewProcedure(def *ProcedureDefinition) *Procedure

func (*Procedure) Execute 

func (p *Procedure) Execute(interpreter *Interpreter)

type ProcedureDefinition 

type ProcedureDefinition struct {
	Values []Value
}

func NewProcedureDefinition 

func NewProcedureDefinition() *ProcedureDefinition

func (*ProcedureDefinition) Add 

func (p *ProcedureDefinition) Add(value Value)

type Scanner 

type Scanner struct {

	// Error is called for each error encountered. If no Error
	// function is set, the error is reported to os.Stderr.
	Error func(s *Scanner, msg string)

	// ErrorCount is incremented by one for each error encountered.
	ErrorCount int

	// The Mode field controls which tokens are recognized. For instance,
	// to recognize Ints, set the ScanInts bit in Mode. The field may be
	// changed at any time.
	Mode uint

	// The Whitespace field controls which characters are recognized
	// as white space. To recognize a character ch <= ' ' as white space,
	// set the ch'th bit in Whitespace (the Scanner's behavior is undefined
	// for values ch > ' '). The field may be changed at any time.
	Whitespace uint64

	// Current token position. The Offset, Line, and Column fields
	// are set by Scan(); the Filename field is left untouched by the
	// Scanner.
	Position
	// contains filtered or unexported fields
}

A Scanner implements reading of Unicode characters and tokens from an io.Reader.

func (*Scanner) Init 

func (s *Scanner) Init(src io.Reader) *Scanner

Init initializes a Scanner with a new source and returns itself. Error is set to nil, ErrorCount is set to 0, Mode is set to GoTokens, and Whitespace is set to GoWhitespace.

func (*Scanner) Next 

func (s *Scanner) Next() rune

Next reads and returns the next Unicode character. It returns EOF at the end of the source. It reports a read error by calling s.Error, if set, or else prints an error message to os.Stderr. Next does not update the Scanner's Position field; use Pos() to get the current position.

func (*Scanner) Peek 

func (s *Scanner) Peek() rune

Peek returns the next Unicode character in the source without advancing the scanner. It returns EOF if the scanner's position is at the last character of the source.

func (*Scanner) Pos 

func (s *Scanner) Pos() Position

Position returns the current source position. If called before Next() or Scan(), it returns the position of the next Unicode character or token returned by these functions. If called afterwards, it returns the position immediately after the last character of the most recent token or character scanned.

func (*Scanner) Scan 

func (s *Scanner) Scan() int

Scan reads the next token or Unicode character from source and returns it. It only recognizes tokens t for which the respective Mode bit (1<<-t) is set. It returns EOF at the end of the source. It reports scanner errors (read and token errors) by calling s.Error, if set; otherwise it prints an error message to os.Stderr.

func (*Scanner) TokenText 

func (s *Scanner) TokenText() string

TokenText returns the string corresponding to the most recently scanned token. Valid after calling Scan().

type Value 

type Value interface{}

type ValueStack 

type ValueStack []Value

Source Files

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