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templateparser.go
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templateparser.go
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package parser
import (
"io"
"strings"
"github.com/a-h/lexical/parse"
)
// TemplateExpression.
// TemplateExpression.
// {% templ Func(p Parameter) %}
type templateExpression struct {
Name Expression
Parameters Expression
}
func newTemplateExpressionParser() templateExpressionParser {
return templateExpressionParser{}
}
var templateNameParser = parse.All(parse.WithStringConcatCombiner,
parse.Letter,
parse.Many(parse.WithStringConcatCombiner, 0, 1000, parse.Any(parse.Letter, parse.ZeroToNine)),
)
type templateExpressionParser struct {
}
var templateExpressionStartParser = createStartParser("templ")
func (p templateExpressionParser) Parse(pi parse.Input) parse.Result {
var r templateExpression
// Check the prefix first.
prefixResult := templateExpressionStartParser(pi)
if !prefixResult.Success {
return prefixResult
}
// Once we have the prefix, we must have a name and parameters.
// Read the name of the function.
from := NewPositionFromInput(pi)
pr := templateNameParser(pi)
if pr.Error != nil && pr.Error != io.EOF {
return pr
}
// If there's no match, the name wasn't correctly terminated.
if !pr.Success {
return parse.Failure("templateExpressionParser", newParseError("template expression: invalid name", from, NewPositionFromInput(pi)))
}
// Remove the final "(" from the position.
to := NewPositionFromInput(pi)
to.Col--
to.Index--
r.Name = NewExpression(strings.TrimSuffix(pr.Item.(string), "("), from, to)
// Eat the left bracket.
if lb := parse.Rune('(')(pi); !lb.Success {
return parse.Failure("templateExpressionParser", newParseError("template expression: parameters missing open bracket", from, NewPositionFromInput(pi)))
}
// Read the parameters.
from = NewPositionFromInput(pi)
pr = parse.StringUntil(parse.Rune(')'))(pi) // p Person, other Other, t thing.Thing)
if pr.Error != nil && pr.Error != io.EOF {
return pr
}
// If there's no match, the name wasn't correctly terminated.
if !pr.Success {
return parse.Failure("templateExpressionParser", newParseError("template expression: parameters missing close bracket", from, NewPositionFromInput(pi)))
}
r.Parameters = NewExpression(strings.TrimSuffix(pr.Item.(string), ")"), from, NewPositionFromInput(pi))
// Eat ") %}".
from = NewPositionFromInput(pi)
if lb := expressionFuncEnd(pi); !lb.Success {
return parse.Failure("templateExpressionParser", newParseError("template expression: unterminated (missing ') %}')", from, NewPositionFromInput(pi)))
}
// Expect a newline.
from = NewPositionFromInput(pi)
if lb := newLine(pi); !lb.Success {
return parse.Failure("templateExpressionParser", newParseError("template expression: missing terminating newline", from, NewPositionFromInput(pi)))
}
return parse.Success("templateExpressionParser", r, nil)
}
// Template node (element, call, if, switch, for, whitespace etc.)
func newTemplateNodeParser(until parse.Function) templateNodeParser {
return templateNodeParser{
until: until,
}
}
type templateNodeParser struct {
until parse.Function
}
func (p templateNodeParser) Parse(pi parse.Input) parse.Result {
op := make([]Node, 0)
for {
var pr parse.Result
// Try for a doctype.
// <!DOCTYPE html>
pr = newDocTypeParser().Parse(pi)
if pr.Error != nil {
return pr
}
if pr.Success {
op = append(op, pr.Item.(Node))
continue
}
// Try for an element.
// <a>, <br/> etc.
pr = newElementParser().Parse(pi)
if pr.Error != nil {
return pr
}
if pr.Success {
op = append(op, pr.Item.(Node))
continue
}
// Try for a string expression.
// {%= "abc" %}
// {%= strings.ToUpper("abc") %}
pr = newStringExpressionParser().Parse(pi)
if pr.Error != nil {
return pr
}
if pr.Success {
op = append(op, pr.Item.(Node))
continue
}
// Try for an if expression.
// if {}
pr = newIfExpressionParser().Parse(pi)
if pr.Error != nil {
return pr
}
if pr.Success {
op = append(op, pr.Item.(Node))
continue
}
// Try for a switch expression.
// switch {}
pr = newSwitchExpressionParser().Parse(pi)
if pr.Error != nil {
return pr
}
if pr.Success {
op = append(op, pr.Item.(Node))
continue
}
// Try for a for expression.
// for {}
pr = newForExpressionParser().Parse(pi)
if pr.Error != nil {
return pr
}
if pr.Success {
op = append(op, pr.Item.(Node))
continue
}
// Try for a call template expression.
// {%! TemplateName(a, b, c) %}
pr = newCallTemplateExpressionParser().Parse(pi)
if pr.Error != nil {
return pr
}
if pr.Success {
op = append(op, pr.Item.(Node))
continue
}
// Eat any whitespace.
pr = optionalWhitespaceParser(pi)
if pr.Error != nil {
return pr
}
if pr.Success && len(pr.Item.(Whitespace).Value) > 0 {
op = append(op, pr.Item.(Whitespace))
continue
}
// Try for text.
// anything & everything accepted...
pr = newTextParser().Parse(pi)
if pr.Error != nil {
return pr
}
if pr.Success && len(pr.Item.(Text).Value) > 0 {
op = append(op, pr.Item.(Text))
continue
}
// Check if we've reached the end.
if p.until == nil {
// In this case, we're just reading as many nodes as we can.
// The element parser checks the final node returned to make sure it's the expected close tag.
break
} else {
start := pi.Index()
pr = p.until(pi)
if pr.Error != nil {
return pr
}
if pr.Success {
if err := rewind(pi, start); err != nil {
return parse.Failure("templateNodeParser", err)
}
return parse.Success("templateNodeParser", op, nil)
}
pos := NewPositionFromInput(pi)
return parse.Failure("templateNodeParser", newParseError("template: unexpected token", pos, pos))
}
}
return parse.Success("templateNodeParser", op, nil)
}