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|
// This file is generated from format_fsm.rl. DO NOT EDIT.
%%{
# (except you are actually in scan_tokens.rl here, so edit away!)
machine formatfsm;
}%%
package stdlib
import (
"bytes"
"fmt"
"unicode/utf8"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/function"
)
%%{
write data;
}%%
func formatFSM(format string, a []cty.Value) (string, error) {
var buf bytes.Buffer
data := format
nextArg := 1 // arg numbers are 1-based
var verb formatVerb
highestArgIdx := 0 // zero means "none", since arg numbers are 1-based
%%{
action begin {
verb = formatVerb{
ArgNum: nextArg,
Prec: -1,
Width: -1,
}
ts = p
}
action emit {
buf.WriteByte(fc);
}
action finish_ok {
}
action finish_err {
return buf.String(), fmt.Errorf("invalid format string starting at offset %d", p)
}
action err_char {
// We'll try to slurp a whole UTF-8 sequence here, to give the user
// better feedback.
r, _ := utf8.DecodeRuneInString(data[p:])
return buf.String(), fmt.Errorf("unrecognized format character %q at offset %d", r, p)
}
action flag_sharp {
verb.Sharp = true
}
action flag_zero {
verb.Zero = true
}
action flag_minus {
verb.Minus = true
}
action flag_plus {
verb.Plus = true
}
action flag_space {
verb.Space = true
}
action argidx_reset {
verb.ArgNum = 0
}
action argidx_num {
verb.ArgNum = (10 * verb.ArgNum) + (int(fc) - '0')
}
action has_width {
verb.HasWidth = true
}
action width_reset {
verb.Width = 0
}
action width_num {
verb.Width = (10 * verb.Width) + (int(fc) - '0')
}
action has_prec {
verb.HasPrec = true
}
action prec_reset {
verb.Prec = 0
}
action prec_num {
verb.Prec = (10 * verb.Prec) + (int(fc) - '0')
}
action mode {
verb.Mode = rune(fc)
te = p+1
verb.Raw = data[ts:te]
verb.Offset = ts
if verb.ArgNum > highestArgIdx {
highestArgIdx = verb.ArgNum
}
err := formatAppend(&verb, &buf, a)
if err != nil {
return buf.String(), err
}
nextArg = verb.ArgNum + 1
}
# a number that isn't zero and doesn't have a leading zero
num = [1-9] [0-9]*;
flags = (
'0' @flag_zero |
'#' @flag_sharp |
'-' @flag_minus |
'+' @flag_plus |
' ' @flag_space
)*;
argidx = ((
'[' (num $argidx_num) ']'
) >argidx_reset)?;
width = (
( num $width_num ) >width_reset %has_width
)?;
precision = (
('.' ( digit* $prec_num )) >prec_reset %has_prec
)?;
# We accept any letter here, but will be more picky in formatAppend
mode = ('a'..'z' | 'A'..'Z') @mode;
fmt_verb = (
'%' @begin
flags
width
precision
argidx
mode
);
main := (
[^%] @emit |
'%%' @emit |
fmt_verb
)* @/finish_err %/finish_ok $!err_char;
}%%
// Ragel state
p := 0 // "Pointer" into data
pe := len(data) // End-of-data "pointer"
cs := 0 // current state (will be initialized by ragel-generated code)
ts := 0
te := 0
eof := pe
// Keep Go compiler happy even if generated code doesn't use these
_ = ts
_ = te
_ = eof
%%{
write init;
write exec;
}%%
// If we fall out here without being in a final state then we've
// encountered something that the scanner can't match, which should
// be impossible (the scanner matches all bytes _somehow_) but we'll
// flag it anyway rather than just losing data from the end.
if cs < formatfsm_first_final {
return buf.String(), fmt.Errorf("extraneous characters beginning at offset %d", p)
}
if highestArgIdx < len(a) {
// Extraneous args are an error, to more easily detect mistakes
firstBad := highestArgIdx+1
if highestArgIdx == 0 {
// Custom error message for this case
return buf.String(), function.NewArgErrorf(firstBad, "too many arguments; no verbs in format string")
}
return buf.String(), function.NewArgErrorf(firstBad, "too many arguments; only %d used by format string", highestArgIdx)
}
return buf.String(), nil
}
|
