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122 lines
3 KiB
Go
122 lines
3 KiB
Go
package pongo2
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import (
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"fmt"
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"regexp"
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)
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var reIdentifiers = regexp.MustCompile("^[a-zA-Z0-9_]+$")
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// Use this Context type to provide constants, variables, instances or functions to your template.
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//
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// pongo2 automatically provides meta-information or functions through the "pongo2"-key.
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// Currently, context["pongo2"] contains the following keys:
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// 1. version: returns the version string
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//
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// Template examples for accessing items from your context:
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// {{ myconstant }}
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// {{ myfunc("test", 42) }}
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// {{ user.name }}
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// {{ pongo2.version }}
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type Context map[string]interface{}
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func (c Context) checkForValidIdentifiers() *Error {
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for k, v := range c {
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if !reIdentifiers.MatchString(k) {
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return &Error{
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Sender: "checkForValidIdentifiers",
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ErrorMsg: fmt.Sprintf("Context-key '%s' (value: '%+v') is not a valid identifier.", k, v),
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}
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}
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}
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return nil
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}
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func (c Context) Update(other Context) Context {
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for k, v := range other {
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c[k] = v
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}
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return c
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}
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// If you're writing a custom tag, your tag's Execute()-function will
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// have access to the ExecutionContext. This struct stores anything
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// about the current rendering process's Context including
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// the Context provided by the user (field Public).
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// You can safely use the Private context to provide data to the user's
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// template (like a 'forloop'-information). The Shared-context is used
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// to share data between tags. All ExecutionContexts share this context.
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//
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// Please be careful when accessing the Public data.
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// PLEASE DO NOT MODIFY THE PUBLIC CONTEXT (read-only).
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//
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// To create your own execution context within tags, use the
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// NewChildExecutionContext(parent) function.
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type ExecutionContext struct {
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template *Template
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Autoescape bool
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Public Context
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Private Context
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Shared Context
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}
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var pongo2MetaContext = Context{
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"version": Version,
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}
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func newExecutionContext(tpl *Template, ctx Context) *ExecutionContext {
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privateCtx := make(Context)
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// Make the pongo2-related funcs/vars available to the context
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privateCtx["pongo2"] = pongo2MetaContext
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return &ExecutionContext{
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template: tpl,
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Public: ctx,
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Private: privateCtx,
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Autoescape: true,
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}
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}
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func NewChildExecutionContext(parent *ExecutionContext) *ExecutionContext {
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newctx := &ExecutionContext{
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template: parent.template,
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Public: parent.Public,
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Private: make(Context),
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Autoescape: parent.Autoescape,
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}
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newctx.Shared = parent.Shared
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// Copy all existing private items
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newctx.Private.Update(parent.Private)
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return newctx
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}
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func (ctx *ExecutionContext) Error(msg string, token *Token) *Error {
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filename := ctx.template.name
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var line, col int
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if token != nil {
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// No tokens available
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// TODO: Add location (from where?)
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filename = token.Filename
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line = token.Line
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col = token.Col
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}
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return &Error{
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Template: ctx.template,
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Filename: filename,
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Line: line,
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Column: col,
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Token: token,
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Sender: "execution",
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ErrorMsg: msg,
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}
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}
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func (ctx *ExecutionContext) Logf(format string, args ...interface{}) {
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ctx.template.set.logf(format, args...)
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}
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