parse

package
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 Go to latest Published: Oct 14, 2023 License: MIT Imports: 1 Imported by: 0

Documentation

Overview

Package parse builds parse trees for templates as defined by text/template and html/template. Clients should use those packages to construct templates rather than this one, which provides shared internal data structures not intended for general use.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func IsEmptyTree 

func IsEmptyTree(n Node) bool

IsEmptyTree reports whether this tree (node) is empty of everything but space or comments.

func Parse 

func Parse(name, text, leftDelim, rightDelim string, funcs ...map[string]any) (map[string]*Tree, error)

Parse returns a map from template name to parse.Tree, created by parsing the templates described in the argument string. The top-level template will be given the specified name. If an error is encountered, parsing stops and an empty map is returned with the error.

Types

type ActionNode 

type ActionNode struct {
	NodeType
	Pos

	Line int
	Pipe *PipeNode
	// contains filtered or unexported fields
}

ActionNode holds an action (something bounded by delimiters). Control actions have their own nodes; ActionNode represents simple ones such as field evaluations and parenthesized pipelines.

func (*ActionNode) Copy 

func (a *ActionNode) Copy() Node

func (*ActionNode) String 

func (a *ActionNode) String() string

type BoolNode 

type BoolNode struct {
	NodeType
	Pos

	True bool
	// contains filtered or unexported fields
}

BoolNode holds a boolean constant.

func (*BoolNode) Copy 

func (b *BoolNode) Copy() Node

func (*BoolNode) String 

func (b *BoolNode) String() string

type BranchNode 

type BranchNode struct {
	NodeType
	Pos

	Line     int
	Pipe     *PipeNode
	List     *ListNode
	ElseList *ListNode
	// contains filtered or unexported fields
}

BranchNode is the common representation of if, range, and with.

func (*BranchNode) Copy added in v1.4.0 

func (b *BranchNode) Copy() Node

func (*BranchNode) String 

func (b *BranchNode) String() string

type BreakNode added in v1.18.0 

type BreakNode struct {
	NodeType
	Pos
	Line int
	// contains filtered or unexported fields
}

BreakNode represents a {{break}} action.

func (*BreakNode) Copy added in v1.18.0 

func (b *BreakNode) Copy() Node

func (*BreakNode) String added in v1.18.0 

func (b *BreakNode) String() string

type ChainNode added in v1.1.0 

type ChainNode struct {
	NodeType
	Pos

	Node  Node
	Field []string
	// contains filtered or unexported fields
}

ChainNode holds a term followed by a chain of field accesses (identifier starting with '.'). The names may be chained ('.x.y'). The periods are dropped from each ident.

func (*ChainNode) Add added in v1.1.0 

func (c *ChainNode) Add(field string)

Add adds the named field (which should start with a period) to the end of the chain.

func (*ChainNode) Copy added in v1.1.0 

func (c *ChainNode) Copy() Node

func (*ChainNode) String added in v1.1.0 

func (c *ChainNode) String() string

type CommandNode 

type CommandNode struct {
	NodeType
	Pos

	Args []Node
	// contains filtered or unexported fields
}

CommandNode holds a command (a pipeline inside an evaluating action).

func (*CommandNode) Copy 

func (c *CommandNode) Copy() Node

func (*CommandNode) String 

func (c *CommandNode) String() string

type CommentNode added in v1.16.0 

type CommentNode struct {
	NodeType
	Pos

	Text string
	// contains filtered or unexported fields
}

CommentNode holds a comment.

func (*CommentNode) Copy added in v1.16.0 

func (c *CommentNode) Copy() Node

func (*CommentNode) String added in v1.16.0 

func (c *CommentNode) String() string

type ContinueNode added in v1.18.0 

type ContinueNode struct {
	NodeType
	Pos
	Line int
	// contains filtered or unexported fields
}

ContinueNode represents a {{continue}} action.

func (*ContinueNode) Copy added in v1.18.0 

func (c *ContinueNode) Copy() Node

func (*ContinueNode) String added in v1.18.0 

func (c *ContinueNode) String() string

type DotNode 

type DotNode struct {
	NodeType
	Pos
	// contains filtered or unexported fields
}

DotNode holds the special identifier '.'.

func (*DotNode) Copy 

func (d *DotNode) Copy() Node

func (*DotNode) String 

func (d *DotNode) String() string

func (*DotNode) Type 

func (d *DotNode) Type() NodeType

type FieldNode 

type FieldNode struct {
	NodeType
	Pos

	Ident []string
	// contains filtered or unexported fields
}

FieldNode holds a field (identifier starting with '.'). The names may be chained ('.x.y'). The period is dropped from each ident.

func (*FieldNode) Copy 

func (f *FieldNode) Copy() Node

func (*FieldNode) String 

func (f *FieldNode) String() string

type IdentifierNode 

type IdentifierNode struct {
	NodeType
	Pos

	Ident string
	// contains filtered or unexported fields
}

IdentifierNode holds an identifier.

func NewIdentifier 

func NewIdentifier(ident string) *IdentifierNode

NewIdentifier returns a new IdentifierNode with the given identifier name.

func (*IdentifierNode) Copy 

func (i *IdentifierNode) Copy() Node

func (*IdentifierNode) SetPos added in v1.1.0 

func (i *IdentifierNode) SetPos(pos Pos) *IdentifierNode

SetPos sets the position. NewIdentifier is a public method so we can't modify its signature. Chained for convenience. TODO: fix one day?

func (*IdentifierNode) SetTree added in v1.4.0 

func (i *IdentifierNode) SetTree(t *Tree) *IdentifierNode

SetTree sets the parent tree for the node. NewIdentifier is a public method so we can't modify its signature. Chained for convenience. TODO: fix one day?

func (*IdentifierNode) String 

func (i *IdentifierNode) String() string

type IfNode 

type IfNode struct {
	BranchNode
}

IfNode represents an {{if}} action and its commands.

func (*IfNode) Copy 

func (i *IfNode) Copy() Node

type ListNode 

type ListNode struct {
	NodeType
	Pos

	Nodes []Node
	// contains filtered or unexported fields
}

ListNode holds a sequence of nodes.

func (*ListNode) Copy 

func (l *ListNode) Copy() Node

func (*ListNode) CopyList 

func (l *ListNode) CopyList() *ListNode

func (*ListNode) String 

func (l *ListNode) String() string

type Mode added in v1.16.0 

type Mode uint

A mode value is a set of flags (or 0). Modes control parser behavior. 

const (
	ParseComments Mode = 1 << iota
	SkipFuncCheck
)

type NilNode added in v1.1.0 

type NilNode struct {
	NodeType
	Pos
	// contains filtered or unexported fields
}

NilNode holds the special identifier 'nil' representing an untyped nil constant.

func (*NilNode) Copy added in v1.1.0 

func (n *NilNode) Copy() Node

func (*NilNode) String added in v1.1.0 

func (n *NilNode) String() string

func (*NilNode) Type added in v1.1.0 

func (n *NilNode) Type() NodeType

type Node 

type Node interface {
	Type() NodeType
	String() string
	// Copy does a deep copy of the Node and all its components.
	// To avoid type assertions, some XxxNodes also have specialized
	// CopyXxx methods that return *XxxNode.
	Copy() Node
	Position() Pos
	// contains filtered or unexported methods
}

A Node is an element in the parse tree. The interface is trivial. The interface contains an unexported method so that only types local to this package can satisfy it.

type NodeType 

type NodeType int

NodeType identifies the type of a parse tree node. 

const (
	NodeText NodeType = iota
	NodeAction
	NodeBool
	NodeChain
	NodeCommand
	NodeDot

	NodeField
	NodeIdentifier
	NodeIf
	NodeList
	NodeNil
	NodeNumber
	NodePipe
	NodeRange
	NodeString
	NodeTemplate
	NodeVariable
	NodeWith
	NodeComment
	NodeBreak
	NodeContinue
)

func (NodeType) Type 

func (t NodeType) Type() NodeType

Type returns itself and provides an easy default implementation for embedding in a Node. Embedded in all non-trivial Nodes.

type NumberNode 

type NumberNode struct {
	NodeType
	Pos

	IsInt      bool
	IsUint     bool
	IsFloat    bool
	IsComplex  bool
	Int64      int64
	Uint64     uint64
	Float64    float64
	Complex128 complex128
	Text       string
	// contains filtered or unexported fields
}

NumberNode holds a number: signed or unsigned integer, float, or complex. The value is parsed and stored under all the types that can represent the value. This simulates in a small amount of code the behavior of Go's ideal constants.

func (*NumberNode) Copy 

func (n *NumberNode) Copy() Node

func (*NumberNode) String 

func (n *NumberNode) String() string

type PipeNode 

type PipeNode struct {
	NodeType
	Pos

	Line     int
	IsAssign bool
	Decl     []*VariableNode
	Cmds     []*CommandNode
	// contains filtered or unexported fields
}

PipeNode holds a pipeline with optional declaration

func (*PipeNode) Copy 

func (p *PipeNode) Copy() Node

func (*PipeNode) CopyPipe 

func (p *PipeNode) CopyPipe() *PipeNode

func (*PipeNode) String 

func (p *PipeNode) String() string

type Pos added in v1.1.0 

type Pos int

Pos represents a byte position in the original input text from which this template was parsed.

func (Pos) Position added in v1.1.0 

func (p Pos) Position() Pos

type RangeNode 

type RangeNode struct {
	BranchNode
}

RangeNode represents a {{range}} action and its commands.

func (*RangeNode) Copy 

func (r *RangeNode) Copy() Node

type StringNode 

type StringNode struct {
	NodeType
	Pos

	Quoted string
	Text   string
	// contains filtered or unexported fields
}

StringNode holds a string constant. The value has been "unquoted".

func (*StringNode) Copy 

func (s *StringNode) Copy() Node

func (*StringNode) String 

func (s *StringNode) String() string

type TemplateNode 

type TemplateNode struct {
	NodeType
	Pos

	Line int
	Name string
	Pipe *PipeNode
	// contains filtered or unexported fields
}

TemplateNode represents a {{template}} action.

func (*TemplateNode) Copy 

func (t *TemplateNode) Copy() Node

func (*TemplateNode) String 

func (t *TemplateNode) String() string

type TextNode 

type TextNode struct {
	NodeType
	Pos

	Text []byte
	// contains filtered or unexported fields
}

TextNode holds plain text.

func (*TextNode) Copy 

func (t *TextNode) Copy() Node

func (*TextNode) String 

func (t *TextNode) String() string

type Tree 

type Tree struct {
	Name      string
	ParseName string
	Root      *ListNode
	Mode      Mode
	// contains filtered or unexported fields
}

Tree is the representation of a single parsed template.

func New 

func New(name string, funcs ...map[string]any) *Tree

New allocates a new parse tree with the given name.

func (*Tree) Copy added in v1.2.0 

func (t *Tree) Copy() *Tree

Copy returns a copy of the Tree. Any parsing state is discarded.

func (*Tree) ErrorContext added in v1.1.0 

func (t *Tree) ErrorContext(n Node) (location, context string)

ErrorContext returns a textual representation of the location of the node in the input text. The receiver is only used when the node does not have a pointer to the tree inside, which can occur in old code.

func (*Tree) Parse 

func (t *Tree) Parse(text, leftDelim, rightDelim string, treeSet map[string]*Tree, funcs ...map[string]any) (tree *Tree, err error)

Parse parses the template definition string to construct a representation of the template for execution. If either action delimiter string is empty, the default ("{{" or "}}") is used. Embedded template definitions are added to the treeSet map.

type VariableNode 

type VariableNode struct {
	NodeType
	Pos

	Ident []string
	// contains filtered or unexported fields
}

VariableNode holds a list of variable names, possibly with chained field accesses. The dollar sign is part of the (first) name.

func (*VariableNode) Copy 

func (v *VariableNode) Copy() Node

func (*VariableNode) String 

func (v *VariableNode) String() string

type WithNode 

type WithNode struct {
	BranchNode
}

WithNode represents a {{with}} action and its commands.

func (*WithNode) Copy 

func (w *WithNode) Copy() Node

Source Files

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