interp

package

v0.0.0-...-f53276d Latest Latest Go to latest Published: Mar 28, 2024 License: MIT Imports: 13 Imported by: 0

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Repository

github.com/hattya/go.sh

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Documentation ¶

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Overview ¶

Package interp implements an interpreter for the Shell Command Language (POSIX.1-2017).

Index ¶

Constants
type ArithExprError
- func (e ArithExprError) Error() string
type ExecEnv
- func NewExecEnv(name string, args ...string) *ExecEnv
type ExpMode
type Option
- func (o Option) String() string
type ParamExpError
- func (e ParamExpError) Error() string
type Var

Constants ¶

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const ADD_ASSIGN = 57361

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const AND_ASSIGN = 57365

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const DEC = 57349

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const DIV_ASSIGN = 57359

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const EQ = 57354

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const GE = 57353

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const IDENT = 57347

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const IFS = " \t\n"

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const INC = 57348

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const LAND = 57356

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const LE = 57352

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const LOR = 57357

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const LSH = 57350

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const LSH_ASSIGN = 57363

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const MOD_ASSIGN = 57360

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const MUL_ASSIGN = 57358

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const NE = 57355

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const NUMBER = 57346

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const OR_ASSIGN = 57367

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const RSH = 57351

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const RSH_ASSIGN = 57364

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const SUB_ASSIGN = 57362

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const XOR_ASSIGN = 57366

Variables ¶

This section is empty.

Functions ¶

This section is empty.

Types ¶

type ArithExprError ¶

type ArithExprError struct {
	Expr string
	Msg  string
}

ArithExprError represents an arithmetic expression error.

func (ArithExprError) Error ¶

func (e ArithExprError) Error() string

type ExecEnv ¶

type ExecEnv struct {
	Args    []string
	Opts    Option
	Aliases map[string]string
	// contains filtered or unexported fields
}

ExecEnv represents a shell execution environment.

func NewExecEnv ¶

func NewExecEnv(name string, args ...string) *ExecEnv

NewExecEnv returns a new ExecEnv.

func (*ExecEnv) Eval ¶

func (env *ExecEnv) Eval(expr string) (n int, err error)

Eval evaluates an arithmetic expression.

func (*ExecEnv) Expand ¶

func (env *ExecEnv) Expand(word ast.Word, mode ExpMode) ([]string, error)

Expand expands a word into multiple fields.

func (*ExecEnv) Get ¶

func (env *ExecEnv) Get(name string) (v Var, set bool)

Get retrieves the variable named by the name.

func (*ExecEnv) Set ¶

func (env *ExecEnv) Set(name, value string)

Set sets the value of the variable named by the name.

func (*ExecEnv) Unset ¶

func (env *ExecEnv) Unset(name string)

Unset unsets the variable named by the name.

func (*ExecEnv) Walk ¶

func (env *ExecEnv) Walk(fn func(Var))

Walk walks the variables, calling fn for each.

type ExpMode ¶

type ExpMode uint

ExpMode controls the behavior of word expansions.

const (
	// Expand a word into a single field, field splitting and pathname
	// expansion will no be performed. The result will be converted the
	// simplest form of parameter expansions into ANSI C style
	// identifiers except for special parameters and positional
	// parameters.
	Arith ExpMode = 1 << iota

	// Expands multiple tilde-prefixes in a word as if it is in an
	// assignment.
	Assign

	// Expand a word into a single field, field splitting and pathname
	// expansion will not be performed.
	Literal

	// Expand a word into a single field, field splitting and pathname
	// expansion will not be performed. The result will be retained if
	// '?', '*', and '[' are quoted.
	Pattern

	// Expands a word as if it is within double-quotes, field splitting
	// and pathname expansion will not be performed.
	Quote
)

type Option ¶

type Option uint

Option represents a shell option.

const (
	AllExport Option = 1 << iota
	ErrExit
	IgnoreEOF
	Monitor
	NoClobber
	NoGlob
	NoExec
	NoLog
	Notify
	NoUnset
	Verbose
	Vi
	XTrace
)

func (Option) String ¶

func (o Option) String() string

type ParamExpError ¶

type ParamExpError struct {
	ParamExp *ast.ParamExp
	Msg      string
}

ParamExpError represents an error in parameter expansion.

func (ParamExpError) Error ¶

func (e ParamExpError) Error() string

type Var ¶

type Var struct {
	Name  string
	Value string

	Export   bool
	ReadOnly bool
}

Var represents a variable.

Source Files ¶

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