parse

package
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Published: Feb 29, 2012 License: BSD-3-Clause Imports: 7 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.

func Parse

func Parse(name, text, leftDelim, rightDelim string, funcs ...map[string]interface{}) (treeSet map[string]*Tree, err 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
	Line int       // The line number in the input.
	Pipe *PipeNode // The pipeline in the action.
}

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

func (*ActionNode) Copy

func (a *ActionNode) Copy() Node

func (*ActionNode) String

func (a *ActionNode) String() string

type BoolNode

type BoolNode struct {
	NodeType
	True bool // The value of the boolean constant.
}

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
	Line     int       // The line number in the input.
	Pipe     *PipeNode // The pipeline to be evaluated.
	List     *ListNode // What to execute if the value is non-empty.
	ElseList *ListNode // What to execute if the value is empty (nil if absent).
}

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

func (*BranchNode) String

func (b *BranchNode) String() string

type CommandNode

type CommandNode struct {
	NodeType
	Args []Node // Arguments in lexical order: Identifier, field, or constant.
}

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 DotNode

type DotNode bool

DotNode holds the special identifier '.'. It is represented by a nil pointer.

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
	Ident []string // The identifiers in lexical order.
}

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
	Ident string // The identifier's name.
}

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) 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
	Nodes []Node // The element nodes in lexical order.
}

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 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
}

A node is an element in the parse tree. The interface is trivial.

type NodeType

type NodeType int

NodeType identifies the type of a parse tree node.

const (
	NodeText    NodeType = iota // Plain text.
	NodeAction                  // A simple action such as field evaluation.
	NodeBool                    // A boolean constant.
	NodeCommand                 // An element of a pipeline.
	NodeDot                     // The cursor, dot.

	NodeField      // A field or method name.
	NodeIdentifier // An identifier; always a function name.
	NodeIf         // An if action.
	NodeList       // A list of Nodes.
	NodeNumber     // A numerical constant.
	NodePipe       // A pipeline of commands.
	NodeRange      // A range action.
	NodeString     // A string constant.
	NodeTemplate   // A template invocation action.
	NodeVariable   // A $ variable.
	NodeWith       // A with action.
)

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
	IsInt      bool       // Number has an integral value.
	IsUint     bool       // Number has an unsigned integral value.
	IsFloat    bool       // Number has a floating-point value.
	IsComplex  bool       // Number is complex.
	Int64      int64      // The signed integer value.
	Uint64     uint64     // The unsigned integer value.
	Float64    float64    // The floating-point value.
	Complex128 complex128 // The complex value.
	Text       string     // The original textual representation from the input.
}

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
	Line int             // The line number in the input.
	Decl []*VariableNode // Variable declarations in lexical order.
	Cmds []*CommandNode  // The commands in lexical order.
}

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 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
	Quoted string // The original text of the string, with quotes.
	Text   string // The string, after quote processing.
}

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
	Line int       // The line number in the input.
	Name string    // The name of the template (unquoted).
	Pipe *PipeNode // The command to evaluate as dot for the template.
}

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
	Text []byte // The text; may span newlines.
}

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    // name of the template represented by the tree.
	Root *ListNode // top-level root of the tree.
	// contains filtered or unexported fields
}

Tree is the representation of a single parsed template.

func New

func New(name string, funcs ...map[string]interface{}) *Tree

New allocates a new parse tree with the given name.

func (*Tree) Parse

func (t *Tree) Parse(s, leftDelim, rightDelim string, treeSet map[string]*Tree, funcs ...map[string]interface{}) (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
	Ident []string // Variable names in lexical order.
}

VariableNode holds a list of variable names. The dollar sign is part of the 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

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