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named_template_build.go
132 lines (124 loc) · 3.05 KB
/
named_template_build.go
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package sqlnt
import (
"fmt"
"regexp"
"strconv"
"strings"
)
func (n *namedTemplate) buildArgs() error {
if err := n.replaceTokens(true); err != nil {
return err
}
var builder strings.Builder
n.argsCount = 0
lastPos := 0
runes := []rune(n.originalStatement)
rlen := len(runes)
purge := func(pos int) {
if pos > lastPos {
builder.WriteString(string(runes[lastPos:pos]))
}
}
getNamed := func(pos int) (string, int, bool, error) {
i := pos + 1
skip := 0
for ; i < rlen; i++ {
if !isNameRune(runes[i]) {
break
}
skip++
}
if skip == 0 {
return "", 0, false, fmt.Errorf("named marker ':' without name (at position %d)", pos)
}
omissible := false
if (i+1) <= rlen && runes[i] == '?' {
omissible = true
skip++
}
return string(runes[pos+1 : i]), skip, omissible, nil
}
for pos := 0; pos < rlen; pos++ {
if runes[pos] == ':' {
purge(pos)
if (pos+1) < rlen && runes[pos+1] == ':' {
// double escaped name marker...
pos++
lastPos = pos
} else {
name, skip, omissible, err := getNamed(pos)
if err != nil {
return err
}
pos += skip
lastPos = pos + 1
builder.WriteString(n.addNamedArg(name, omissible))
}
}
}
purge(rlen)
n.statement = builder.String()
return nil
}
var tokenRegexp = regexp.MustCompile(`\{\{([^}]*)}}`)
func (n *namedTemplate) replaceTokens(first bool) error {
errs := make([]string, 0)
n.originalStatement = tokenRegexp.ReplaceAllStringFunc(n.originalStatement, func(s string) string {
token := s[2 : len(s)-2]
for _, tr := range n.tokenOptions {
if r, ok := tr.Replace(token); ok {
return r
}
}
errs = append(errs, token)
return ""
})
if len(errs) == 1 {
return fmt.Errorf("unknown token: %s", errs[0])
} else if len(errs) > 0 {
return fmt.Errorf("unknown tokens: %s", strings.Join(errs, ", "))
}
if first && strings.Contains(n.originalStatement, "{{") && strings.Contains(n.originalStatement, "}}") {
return n.replaceTokens(false)
}
return nil
}
func isNameRune(r rune) bool {
return r == '_' || r == '-' || r == '.' || (r >= '0' && r <= '9') || (r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z')
}
func (n *namedTemplate) addNamedArg(name string, omissible bool) string {
if n.usePositionalTags {
return n.addNamedArgPositional(name, omissible)
} else {
return n.addNamedArgNonPositional(name, omissible)
}
}
func (n *namedTemplate) addNamedArgPositional(name string, omissible bool) string {
if arg, ok := n.args[name]; ok {
arg.setOmissible(omissible)
return arg.tag
} else {
tag := n.argTag + strconv.Itoa(n.argsCount+1)
n.args[name] = &namedArg{
tag: tag,
positions: []int{n.argsCount},
omissible: omissible,
}
n.argsCount++
return tag
}
}
func (n *namedTemplate) addNamedArgNonPositional(name string, omissible bool) string {
if arg, ok := n.args[name]; ok {
arg.setOmissible(omissible)
arg.positions = append(arg.positions, n.argsCount)
} else {
n.args[name] = &namedArg{
tag: n.argTag,
positions: []int{n.argsCount},
omissible: omissible,
}
}
n.argsCount++
return n.argTag
}