Shinichiro Hamaji | b69bf8a | 2015-06-10 14:52:06 +0900 | [diff] [blame] | 1 | // Copyright 2015 Google Inc. All rights reserved |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 15 | package main |
| 16 | |
| 17 | import ( |
| 18 | "bytes" |
| 19 | "errors" |
| 20 | "fmt" |
| 21 | "io" |
Fumitoshi Ukai | f0a2ba7 | 2015-04-19 00:02:32 +0900 | [diff] [blame] | 22 | "strconv" |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 23 | "strings" |
Fumitoshi Ukai | b06cd9d | 2015-05-07 12:56:12 +0900 | [diff] [blame] | 24 | "sync" |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 25 | ) |
| 26 | |
| 27 | var ( |
| 28 | errEndOfInput = errors.New("parse: unexpected end of input") |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 29 | errNotLiteral = errors.New("valueNum: not literal") |
Fumitoshi Ukai | b06cd9d | 2015-05-07 12:56:12 +0900 | [diff] [blame] | 30 | |
| 31 | bufFree = sync.Pool{ |
Fumitoshi Ukai | d0bf88c | 2015-05-08 10:54:32 +0900 | [diff] [blame] | 32 | New: func() interface{} { return new(buffer) }, |
Fumitoshi Ukai | b06cd9d | 2015-05-07 12:56:12 +0900 | [diff] [blame] | 33 | } |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 34 | ) |
| 35 | |
Fumitoshi Ukai | d0bf88c | 2015-05-08 10:54:32 +0900 | [diff] [blame] | 36 | type buffer struct { |
| 37 | bytes.Buffer |
| 38 | args [][]byte |
| 39 | } |
| 40 | |
| 41 | func newBuf() *buffer { |
| 42 | buf := bufFree.Get().(*buffer) |
Fumitoshi Ukai | b06cd9d | 2015-05-07 12:56:12 +0900 | [diff] [blame] | 43 | return buf |
| 44 | } |
| 45 | |
Fumitoshi Ukai | d0bf88c | 2015-05-08 10:54:32 +0900 | [diff] [blame] | 46 | func freeBuf(buf *buffer) { |
Fumitoshi Ukai | 7ff5b23 | 2015-05-08 00:44:12 +0900 | [diff] [blame] | 47 | if cap(buf.Bytes()) > 1024 { |
| 48 | return |
| 49 | } |
Fumitoshi Ukai | b06cd9d | 2015-05-07 12:56:12 +0900 | [diff] [blame] | 50 | buf.Reset() |
Fumitoshi Ukai | d0bf88c | 2015-05-08 10:54:32 +0900 | [diff] [blame] | 51 | buf.args = buf.args[:0] |
Fumitoshi Ukai | b06cd9d | 2015-05-07 12:56:12 +0900 | [diff] [blame] | 52 | bufFree.Put(buf) |
| 53 | } |
| 54 | |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 55 | type Value interface { |
| 56 | String() string |
| 57 | Eval(w io.Writer, ev *Evaluator) |
Shinichiro Hamaji | c8bc731 | 2015-04-28 02:48:03 +0900 | [diff] [blame] | 58 | Serialize() SerializableVar |
Shinichiro Hamaji | 723f56a | 2015-05-15 17:12:55 +0900 | [diff] [blame] | 59 | Dump(w io.Writer) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 60 | } |
| 61 | |
Fumitoshi Ukai | 6ac7f69 | 2015-04-15 17:13:51 +0900 | [diff] [blame] | 62 | type Valuer interface { |
| 63 | Value() []byte |
| 64 | } |
| 65 | |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 66 | // literal is literal value. |
| 67 | type literal string |
| 68 | |
| 69 | func (s literal) String() string { return string(s) } |
| 70 | func (s literal) Eval(w io.Writer, ev *Evaluator) { |
Fumitoshi Ukai | 5541c7e | 2015-04-18 22:47:03 +0900 | [diff] [blame] | 71 | io.WriteString(w, string(s)) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 72 | } |
Shinichiro Hamaji | c8bc731 | 2015-04-28 02:48:03 +0900 | [diff] [blame] | 73 | func (s literal) Serialize() SerializableVar { |
| 74 | return SerializableVar{Type: "literal", V: string(s)} |
| 75 | } |
Shinichiro Hamaji | 723f56a | 2015-05-15 17:12:55 +0900 | [diff] [blame] | 76 | func (s literal) Dump(w io.Writer) { |
Fumitoshi Ukai | 936de10 | 2015-06-08 11:21:16 +0900 | [diff] [blame] | 77 | dumpByte(w, ValueTypeLiteral) |
Shinichiro Hamaji | 723f56a | 2015-05-15 17:12:55 +0900 | [diff] [blame] | 78 | dumpBytes(w, []byte(s)) |
| 79 | } |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 80 | |
| 81 | // tmpval is temporary value. |
| 82 | type tmpval []byte |
| 83 | |
| 84 | func (t tmpval) String() string { return string(t) } |
| 85 | func (t tmpval) Eval(w io.Writer, ev *Evaluator) { |
| 86 | w.Write(t) |
| 87 | } |
Fumitoshi Ukai | 6ac7f69 | 2015-04-15 17:13:51 +0900 | [diff] [blame] | 88 | func (t tmpval) Value() []byte { return []byte(t) } |
Shinichiro Hamaji | c8bc731 | 2015-04-28 02:48:03 +0900 | [diff] [blame] | 89 | func (t tmpval) Serialize() SerializableVar { |
| 90 | return SerializableVar{Type: "tmpval", V: string(t)} |
| 91 | } |
Shinichiro Hamaji | 723f56a | 2015-05-15 17:12:55 +0900 | [diff] [blame] | 92 | func (t tmpval) Dump(w io.Writer) { |
Fumitoshi Ukai | 936de10 | 2015-06-08 11:21:16 +0900 | [diff] [blame] | 93 | dumpByte(w, ValueTypeTmpval) |
Shinichiro Hamaji | 723f56a | 2015-05-15 17:12:55 +0900 | [diff] [blame] | 94 | dumpBytes(w, t) |
| 95 | } |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 96 | |
| 97 | // Expr is a list of values. |
| 98 | type Expr []Value |
| 99 | |
| 100 | func (e Expr) String() string { |
| 101 | var s []string |
| 102 | for _, v := range e { |
| 103 | s = append(s, v.String()) |
| 104 | } |
| 105 | return strings.Join(s, "") |
| 106 | } |
| 107 | |
| 108 | func (e Expr) Eval(w io.Writer, ev *Evaluator) { |
| 109 | for _, v := range e { |
| 110 | v.Eval(w, ev) |
| 111 | } |
| 112 | } |
| 113 | |
Shinichiro Hamaji | c8bc731 | 2015-04-28 02:48:03 +0900 | [diff] [blame] | 114 | func (e Expr) Serialize() SerializableVar { |
| 115 | r := SerializableVar{Type: "expr"} |
| 116 | for _, v := range e { |
| 117 | r.Children = append(r.Children, v.Serialize()) |
| 118 | } |
| 119 | return r |
| 120 | } |
Shinichiro Hamaji | 723f56a | 2015-05-15 17:12:55 +0900 | [diff] [blame] | 121 | func (e Expr) Dump(w io.Writer) { |
Fumitoshi Ukai | 936de10 | 2015-06-08 11:21:16 +0900 | [diff] [blame] | 122 | dumpByte(w, ValueTypeExpr) |
Shinichiro Hamaji | 723f56a | 2015-05-15 17:12:55 +0900 | [diff] [blame] | 123 | dumpInt(w, len(e)) |
| 124 | for _, v := range e { |
| 125 | v.Dump(w) |
| 126 | } |
| 127 | } |
Shinichiro Hamaji | c8bc731 | 2015-04-28 02:48:03 +0900 | [diff] [blame] | 128 | |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 129 | func compactExpr(e Expr) Value { |
| 130 | if len(e) == 1 { |
| 131 | return e[0] |
| 132 | } |
| 133 | // TODO(ukai): concat literal |
| 134 | return e |
| 135 | } |
| 136 | |
| 137 | // varref is variable reference. e.g. ${foo}. |
| 138 | type varref struct { |
| 139 | varname Value |
| 140 | } |
| 141 | |
| 142 | func (v varref) String() string { |
| 143 | varname := v.varname.String() |
| 144 | if len(varname) == 1 { |
| 145 | return fmt.Sprintf("$%s", varname) |
| 146 | } |
| 147 | return fmt.Sprintf("${%s}", varname) |
| 148 | } |
| 149 | |
| 150 | func (v varref) Eval(w io.Writer, ev *Evaluator) { |
Fumitoshi Ukai | 8341013 | 2015-06-15 14:50:07 +0900 | [diff] [blame] | 151 | te := traceEvent.begin("var", v, traceEventMain) |
Fumitoshi Ukai | b06cd9d | 2015-05-07 12:56:12 +0900 | [diff] [blame] | 152 | buf := newBuf() |
| 153 | v.varname.Eval(buf, ev) |
| 154 | vv := ev.LookupVar(buf.String()) |
| 155 | freeBuf(buf) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 156 | vv.Eval(w, ev) |
Fumitoshi Ukai | 432a242 | 2015-06-11 15:16:29 +0900 | [diff] [blame] | 157 | traceEvent.end(te) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 158 | } |
| 159 | |
Shinichiro Hamaji | c8bc731 | 2015-04-28 02:48:03 +0900 | [diff] [blame] | 160 | func (v varref) Serialize() SerializableVar { |
| 161 | return SerializableVar{ |
Shinichiro Hamaji | 3d6d0aa | 2015-04-28 16:18:44 +0900 | [diff] [blame] | 162 | Type: "varref", |
Shinichiro Hamaji | c8bc731 | 2015-04-28 02:48:03 +0900 | [diff] [blame] | 163 | Children: []SerializableVar{v.varname.Serialize()}, |
| 164 | } |
| 165 | } |
Shinichiro Hamaji | 723f56a | 2015-05-15 17:12:55 +0900 | [diff] [blame] | 166 | func (v varref) Dump(w io.Writer) { |
Fumitoshi Ukai | 936de10 | 2015-06-08 11:21:16 +0900 | [diff] [blame] | 167 | dumpByte(w, ValueTypeVarref) |
Shinichiro Hamaji | 723f56a | 2015-05-15 17:12:55 +0900 | [diff] [blame] | 168 | v.varname.Dump(w) |
| 169 | } |
Shinichiro Hamaji | c8bc731 | 2015-04-28 02:48:03 +0900 | [diff] [blame] | 170 | |
Fumitoshi Ukai | f0a2ba7 | 2015-04-19 00:02:32 +0900 | [diff] [blame] | 171 | // paramref is parameter reference e.g. $1. |
| 172 | type paramref int |
| 173 | |
| 174 | func (p paramref) String() string { |
| 175 | return fmt.Sprintf("$%d", int(p)) |
| 176 | } |
| 177 | |
| 178 | func (p paramref) Eval(w io.Writer, ev *Evaluator) { |
Fumitoshi Ukai | 8341013 | 2015-06-15 14:50:07 +0900 | [diff] [blame] | 179 | te := traceEvent.begin("param", p, traceEventMain) |
Fumitoshi Ukai | f0a2ba7 | 2015-04-19 00:02:32 +0900 | [diff] [blame] | 180 | n := int(p) |
| 181 | if n < len(ev.paramVars) { |
| 182 | ev.paramVars[n].Eval(w, ev) |
| 183 | } else { |
| 184 | // out of range? |
| 185 | // panic(fmt.Sprintf("out of range %d: %d", n, len(ev.paramVars))) |
| 186 | } |
Fumitoshi Ukai | 432a242 | 2015-06-11 15:16:29 +0900 | [diff] [blame] | 187 | traceEvent.end(te) |
Fumitoshi Ukai | f0a2ba7 | 2015-04-19 00:02:32 +0900 | [diff] [blame] | 188 | } |
| 189 | |
Shinichiro Hamaji | c8bc731 | 2015-04-28 02:48:03 +0900 | [diff] [blame] | 190 | func (p paramref) Serialize() SerializableVar { |
| 191 | return SerializableVar{Type: "paramref", V: strconv.Itoa(int(p))} |
| 192 | } |
| 193 | |
Shinichiro Hamaji | 723f56a | 2015-05-15 17:12:55 +0900 | [diff] [blame] | 194 | func (p paramref) Dump(w io.Writer) { |
Fumitoshi Ukai | 936de10 | 2015-06-08 11:21:16 +0900 | [diff] [blame] | 195 | dumpByte(w, ValueTypeParamref) |
Shinichiro Hamaji | 723f56a | 2015-05-15 17:12:55 +0900 | [diff] [blame] | 196 | dumpInt(w, int(p)) |
| 197 | } |
| 198 | |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 199 | // varsubst is variable substitutaion. e.g. ${var:pat=subst}. |
| 200 | type varsubst struct { |
| 201 | varname Value |
| 202 | pat Value |
| 203 | subst Value |
| 204 | } |
| 205 | |
| 206 | func (v varsubst) String() string { |
| 207 | return fmt.Sprintf("${%s:%s=%s}", v.varname, v.pat, v.subst) |
| 208 | } |
| 209 | |
| 210 | func (v varsubst) Eval(w io.Writer, ev *Evaluator) { |
Fumitoshi Ukai | 8341013 | 2015-06-15 14:50:07 +0900 | [diff] [blame] | 211 | te := traceEvent.begin("varsubst", v, traceEventMain) |
Fumitoshi Ukai | b06cd9d | 2015-05-07 12:56:12 +0900 | [diff] [blame] | 212 | buf := newBuf() |
| 213 | params := ev.args(buf, v.varname, v.pat, v.subst) |
| 214 | vname := string(params[0]) |
| 215 | pat := string(params[1]) |
| 216 | subst := string(params[2]) |
| 217 | buf.Reset() |
| 218 | vv := ev.LookupVar(vname) |
| 219 | vv.Eval(buf, ev) |
| 220 | vals := splitSpaces(buf.String()) |
| 221 | freeBuf(buf) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 222 | space := false |
| 223 | for _, val := range vals { |
| 224 | if space { |
Fumitoshi Ukai | 5541c7e | 2015-04-18 22:47:03 +0900 | [diff] [blame] | 225 | io.WriteString(w, " ") |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 226 | } |
Fumitoshi Ukai | b06cd9d | 2015-05-07 12:56:12 +0900 | [diff] [blame] | 227 | io.WriteString(w, substRef(pat, subst, val)) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 228 | space = true |
| 229 | } |
Fumitoshi Ukai | 432a242 | 2015-06-11 15:16:29 +0900 | [diff] [blame] | 230 | traceEvent.end(te) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 231 | } |
| 232 | |
Shinichiro Hamaji | 723f56a | 2015-05-15 17:12:55 +0900 | [diff] [blame] | 233 | func (v varsubst) Serialize() SerializableVar { |
Shinichiro Hamaji | c8bc731 | 2015-04-28 02:48:03 +0900 | [diff] [blame] | 234 | return SerializableVar{ |
| 235 | Type: "varsubst", |
| 236 | Children: []SerializableVar{ |
Shinichiro Hamaji | 723f56a | 2015-05-15 17:12:55 +0900 | [diff] [blame] | 237 | v.varname.Serialize(), |
| 238 | v.pat.Serialize(), |
| 239 | v.subst.Serialize(), |
Shinichiro Hamaji | c8bc731 | 2015-04-28 02:48:03 +0900 | [diff] [blame] | 240 | }, |
| 241 | } |
| 242 | } |
| 243 | |
Shinichiro Hamaji | 723f56a | 2015-05-15 17:12:55 +0900 | [diff] [blame] | 244 | func (v varsubst) Dump(w io.Writer) { |
Fumitoshi Ukai | 936de10 | 2015-06-08 11:21:16 +0900 | [diff] [blame] | 245 | dumpByte(w, ValueTypeVarsubst) |
Shinichiro Hamaji | 723f56a | 2015-05-15 17:12:55 +0900 | [diff] [blame] | 246 | v.varname.Dump(w) |
| 247 | v.pat.Dump(w) |
| 248 | v.subst.Dump(w) |
| 249 | } |
| 250 | |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 251 | func str(buf []byte, alloc bool) Value { |
| 252 | if alloc { |
| 253 | return literal(string(buf)) |
| 254 | } |
| 255 | return tmpval(buf) |
| 256 | } |
| 257 | |
| 258 | func appendStr(expr Expr, buf []byte, alloc bool) Expr { |
| 259 | if len(buf) == 0 { |
| 260 | return expr |
| 261 | } |
| 262 | if len(expr) == 0 { |
| 263 | return Expr{str(buf, alloc)} |
| 264 | } |
| 265 | switch v := expr[len(expr)-1].(type) { |
| 266 | case literal: |
| 267 | v += literal(string(buf)) |
| 268 | expr[len(expr)-1] = v |
| 269 | return expr |
| 270 | case tmpval: |
| 271 | v = append(v, buf...) |
| 272 | expr[len(expr)-1] = v |
| 273 | return expr |
| 274 | } |
| 275 | return append(expr, str(buf, alloc)) |
| 276 | } |
| 277 | |
| 278 | func valueNum(v Value) (int, error) { |
| 279 | switch v := v.(type) { |
| 280 | case literal, tmpval: |
| 281 | n, err := strconv.ParseInt(v.String(), 10, 64) |
| 282 | return int(n), err |
| 283 | } |
| 284 | return 0, errNotLiteral |
| 285 | } |
| 286 | |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 287 | // parseExpr parses expression in `in` until it finds any byte in term. |
| 288 | // if term is nil, it will parse to end of input. |
| 289 | // if term is not nil, and it reaches to end of input, return errEndOfInput. |
| 290 | // it returns parsed value, and parsed length `n`, so in[n-1] is any byte of |
| 291 | // term, and in[n:] is next input. |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 292 | // if alloc is true, text will be literal (allocate string). |
| 293 | // otherwise, text will be tmpval on in. |
| 294 | func parseExpr(in, term []byte, alloc bool) (Value, int, error) { |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 295 | var expr Expr |
Fumitoshi Ukai | 00178d1 | 2015-04-18 00:11:05 +0900 | [diff] [blame] | 296 | b := 0 |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 297 | i := 0 |
| 298 | var saveParen byte |
| 299 | parenDepth := 0 |
| 300 | Loop: |
| 301 | for i < len(in) { |
| 302 | ch := in[i] |
Fumitoshi Ukai | 96c79f1 | 2015-04-18 22:58:13 +0900 | [diff] [blame] | 303 | if term != nil && bytes.IndexByte(term, ch) >= 0 { |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 304 | break Loop |
| 305 | } |
| 306 | switch ch { |
| 307 | case '$': |
| 308 | if i+1 >= len(in) { |
| 309 | break Loop |
| 310 | } |
| 311 | if in[i+1] == '$' { |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 312 | expr = appendStr(expr, in[b:i+1], alloc) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 313 | i += 2 |
Fumitoshi Ukai | 00178d1 | 2015-04-18 00:11:05 +0900 | [diff] [blame] | 314 | b = i |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 315 | continue |
| 316 | } |
| 317 | if bytes.IndexByte(term, in[i+1]) >= 0 { |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 318 | expr = appendStr(expr, in[b:i], alloc) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 319 | expr = append(expr, varref{varname: literal("")}) |
| 320 | i++ |
Fumitoshi Ukai | 00178d1 | 2015-04-18 00:11:05 +0900 | [diff] [blame] | 321 | b = i |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 322 | break Loop |
| 323 | } |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 324 | expr = appendStr(expr, in[b:i], alloc) |
| 325 | v, n, err := parseDollar(in[i:], alloc) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 326 | if err != nil { |
| 327 | return nil, 0, err |
| 328 | } |
| 329 | i += n |
Fumitoshi Ukai | 00178d1 | 2015-04-18 00:11:05 +0900 | [diff] [blame] | 330 | b = i |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 331 | expr = append(expr, v) |
| 332 | continue |
| 333 | case '(', '{': |
| 334 | cp := closeParen(ch) |
| 335 | if i := bytes.IndexByte(term, cp); i >= 0 { |
| 336 | parenDepth++ |
| 337 | saveParen = cp |
| 338 | term[i] = 0 |
| 339 | } else if cp == saveParen { |
| 340 | parenDepth++ |
| 341 | } |
| 342 | case saveParen: |
| 343 | parenDepth-- |
| 344 | if parenDepth == 0 { |
| 345 | i := bytes.IndexByte(term, 0) |
| 346 | term[i] = saveParen |
| 347 | saveParen = 0 |
| 348 | } |
| 349 | } |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 350 | i++ |
| 351 | } |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 352 | expr = appendStr(expr, in[b:i], alloc) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 353 | if i == len(in) && term != nil { |
| 354 | return expr, i, errEndOfInput |
| 355 | } |
| 356 | return compactExpr(expr), i, nil |
| 357 | } |
| 358 | |
| 359 | func closeParen(ch byte) byte { |
| 360 | switch ch { |
| 361 | case '(': |
| 362 | return ')' |
| 363 | case '{': |
| 364 | return '}' |
| 365 | } |
| 366 | return 0 |
| 367 | } |
| 368 | |
| 369 | // parseDollar parses |
| 370 | // $(func expr[, expr...]) # func = literal SP |
| 371 | // $(expr:expr=expr) |
| 372 | // $(expr) |
| 373 | // $x |
| 374 | // it returns parsed value and parsed length. |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 375 | func parseDollar(in []byte, alloc bool) (Value, int, error) { |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 376 | if len(in) <= 1 { |
| 377 | return nil, 0, errors.New("empty expr") |
| 378 | } |
| 379 | if in[0] != '$' { |
| 380 | return nil, 0, errors.New("should starts with $") |
| 381 | } |
| 382 | if in[1] == '$' { |
| 383 | return nil, 0, errors.New("should handle $$ as literal $") |
| 384 | } |
| 385 | paren := closeParen(in[1]) |
| 386 | if paren == 0 { |
| 387 | // $x case. |
Fumitoshi Ukai | f0a2ba7 | 2015-04-19 00:02:32 +0900 | [diff] [blame] | 388 | if in[1] >= '0' && in[1] <= '9' { |
| 389 | return paramref(in[1] - '0'), 2, nil |
| 390 | } |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 391 | return varref{varname: str(in[1:2], alloc)}, 2, nil |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 392 | } |
| 393 | term := []byte{paren, ':', ' '} |
| 394 | var varname Expr |
| 395 | i := 2 |
| 396 | Again: |
| 397 | for { |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 398 | e, n, err := parseExpr(in[i:], term, alloc) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 399 | if err != nil { |
| 400 | return nil, 0, err |
| 401 | } |
| 402 | varname = append(varname, e) |
| 403 | i += n |
| 404 | switch in[i] { |
| 405 | case paren: |
| 406 | // ${expr} |
Fumitoshi Ukai | f0a2ba7 | 2015-04-19 00:02:32 +0900 | [diff] [blame] | 407 | vname := compactExpr(varname) |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 408 | n, err := valueNum(vname) |
| 409 | if err == nil { |
| 410 | // ${n} |
| 411 | return paramref(n), i + 1, nil |
Fumitoshi Ukai | f0a2ba7 | 2015-04-19 00:02:32 +0900 | [diff] [blame] | 412 | } |
| 413 | return varref{varname: vname}, i + 1, nil |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 414 | case ' ': |
| 415 | // ${e ...} |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 416 | switch token := e.(type) { |
| 417 | case literal, tmpval: |
| 418 | funcName := intern(token.String()) |
Shinichiro Hamaji | 2216dd6 | 2015-04-11 13:44:39 +0900 | [diff] [blame] | 419 | if f, ok := funcMap[funcName]; ok { |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 420 | return parseFunc(f(), in, i+1, term[:1], funcName, alloc) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 421 | } |
| 422 | } |
| 423 | term = term[:2] // drop ' ' |
| 424 | continue Again |
| 425 | case ':': |
| 426 | // ${varname:...} |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 427 | colon := in[i:i+1] |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 428 | term = term[:2] |
| 429 | term[1] = '=' // term={paren, '='}. |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 430 | e, n, err := parseExpr(in[i+1:], term, alloc) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 431 | if err != nil { |
| 432 | return nil, 0, err |
| 433 | } |
| 434 | i += 1 + n |
| 435 | if in[i] == paren { |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 436 | varname = appendStr(varname, colon, alloc) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 437 | return varref{varname: varname}, i + 1, nil |
| 438 | } |
| 439 | // ${varname:xx=...} |
| 440 | pat := e |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 441 | subst, n, err := parseExpr(in[i+1:], term[:1], alloc) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 442 | if err != nil { |
| 443 | return nil, 0, err |
| 444 | } |
| 445 | i += 1 + n |
| 446 | // ${first:pat=e} |
| 447 | return varsubst{ |
| 448 | varname: compactExpr(varname), |
| 449 | pat: pat, |
| 450 | subst: subst, |
| 451 | }, i + 1, nil |
| 452 | default: |
| 453 | panic(fmt.Sprintf("unexpected char")) |
| 454 | } |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | // skipSpaces skips spaces at front of `in` before any bytes in term. |
| 459 | // in[n] will be the first non white space in in. |
| 460 | func skipSpaces(in, term []byte) int { |
| 461 | for i := 0; i < len(in); i++ { |
| 462 | if bytes.IndexByte(term, in[i]) >= 0 { |
| 463 | return i |
| 464 | } |
| 465 | switch in[i] { |
| 466 | case ' ', '\t': |
| 467 | default: |
| 468 | return i |
| 469 | } |
| 470 | } |
| 471 | return len(in) |
| 472 | } |
| 473 | |
Fumitoshi Ukai | ee5c6fc | 2015-04-16 13:13:10 +0900 | [diff] [blame] | 474 | // trimLiteralSpace trims literal space around v. |
| 475 | func trimLiteralSpace(v Value) Value { |
| 476 | switch v := v.(type) { |
| 477 | case literal: |
| 478 | return literal(strings.TrimSpace(string(v))) |
| 479 | case tmpval: |
| 480 | b := bytes.TrimSpace([]byte(v)) |
| 481 | if len(b) == 0 { |
| 482 | return literal("") |
| 483 | } |
| 484 | return tmpval(b) |
| 485 | case Expr: |
| 486 | if len(v) == 0 { |
| 487 | return v |
| 488 | } |
| 489 | switch s := v[0].(type) { |
| 490 | case literal, tmpval: |
| 491 | t := trimLiteralSpace(s) |
| 492 | if t == literal("") { |
| 493 | v = v[1:] |
| 494 | } else { |
| 495 | v[0] = t |
| 496 | } |
| 497 | } |
| 498 | switch s := v[len(v)-1].(type) { |
| 499 | case literal, tmpval: |
| 500 | t := trimLiteralSpace(s) |
| 501 | if t == literal("") { |
| 502 | v = v[:len(v)-1] |
| 503 | } else { |
| 504 | v[len(v)-1] = t |
| 505 | } |
| 506 | } |
| 507 | return compactExpr(v) |
| 508 | } |
| 509 | return v |
| 510 | } |
| 511 | |
| 512 | // concatLine concatinates line with "\\\n" in function expression. |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 513 | // TODO(ukai): less alloc? |
Fumitoshi Ukai | ee5c6fc | 2015-04-16 13:13:10 +0900 | [diff] [blame] | 514 | func concatLine(v Value) Value { |
| 515 | switch v := v.(type) { |
| 516 | case literal: |
| 517 | for { |
| 518 | s := string(v) |
| 519 | i := strings.Index(s, "\\\n") |
| 520 | if i < 0 { |
| 521 | return v |
| 522 | } |
| 523 | v = literal(s[:i] + strings.TrimLeft(s[i+2:], " \t")) |
| 524 | } |
| 525 | case tmpval: |
| 526 | for { |
| 527 | b := []byte(v) |
| 528 | i := bytes.Index(b, []byte{'\\', '\n'}) |
| 529 | if i < 0 { |
| 530 | return v |
| 531 | } |
| 532 | var buf bytes.Buffer |
| 533 | buf.Write(b[:i]) |
| 534 | buf.Write(bytes.TrimLeft(b[i+2:], " \t")) |
Fumitoshi Ukai | d8d8425 | 2015-04-19 17:30:13 +0900 | [diff] [blame] | 535 | v = tmpval(buf.Bytes()) |
Fumitoshi Ukai | ee5c6fc | 2015-04-16 13:13:10 +0900 | [diff] [blame] | 536 | } |
| 537 | case Expr: |
| 538 | for i := range v { |
| 539 | switch vv := v[i].(type) { |
| 540 | case literal, tmpval: |
| 541 | v[i] = concatLine(vv) |
| 542 | } |
| 543 | } |
| 544 | return v |
| 545 | } |
| 546 | return v |
| 547 | } |
| 548 | |
Fumitoshi Ukai | ebf945c | 2015-04-10 17:30:04 +0900 | [diff] [blame] | 549 | // parseFunc parses function arguments from in[s:] for f. |
Fumitoshi Ukai | b2670d9 | 2015-04-16 10:28:27 +0900 | [diff] [blame] | 550 | // in[0] is '$' and in[s] is space just after func name. |
Fumitoshi Ukai | ebf945c | 2015-04-10 17:30:04 +0900 | [diff] [blame] | 551 | // in[:n] will be "${func args...}" |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 552 | func parseFunc(f Func, in []byte, s int, term []byte, funcName string, alloc bool) (Value, int, error) { |
| 553 | f.AddArg(str(in[1:s-1], alloc)) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 554 | arity := f.Arity() |
| 555 | term = append(term, ',') |
Fumitoshi Ukai | ebf945c | 2015-04-10 17:30:04 +0900 | [diff] [blame] | 556 | i := skipSpaces(in[s:], term) |
| 557 | i = s + i |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 558 | if i == len(in) { |
| 559 | return f, i, nil |
| 560 | } |
| 561 | narg := 1 |
| 562 | for { |
| 563 | if arity != 0 && narg >= arity { |
| 564 | // final arguments. |
| 565 | term = term[:1] // drop ',' |
| 566 | } |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 567 | v, n, err := parseExpr(in[i:], term, alloc) |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 568 | if err != nil { |
| 569 | return nil, 0, err |
| 570 | } |
Fumitoshi Ukai | ee5c6fc | 2015-04-16 13:13:10 +0900 | [diff] [blame] | 571 | v = concatLine(v) |
Fumitoshi Ukai | da7f255 | 2015-04-16 13:33:37 +0900 | [diff] [blame] | 572 | // TODO(ukai): do this in funcIf, funcAnd, or funcOr's compactor? |
Fumitoshi Ukai | ee5c6fc | 2015-04-16 13:13:10 +0900 | [diff] [blame] | 573 | if (narg == 1 && funcName == "if") || funcName == "and" || funcName == "or" { |
| 574 | v = trimLiteralSpace(v) |
| 575 | } |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 576 | f.AddArg(v) |
| 577 | i += n |
| 578 | narg++ |
| 579 | if in[i] == term[0] { |
| 580 | i++ |
| 581 | break |
| 582 | } |
| 583 | i++ // should be ',' |
| 584 | if i == len(in) { |
| 585 | break |
| 586 | } |
| 587 | } |
Fumitoshi Ukai | 9f6b635 | 2015-04-16 16:25:09 +0900 | [diff] [blame] | 588 | var fv Value |
| 589 | fv = f |
Fumitoshi Ukai | da7f255 | 2015-04-16 13:33:37 +0900 | [diff] [blame] | 590 | if compactor, ok := f.(Compactor); ok { |
Fumitoshi Ukai | 9f6b635 | 2015-04-16 16:25:09 +0900 | [diff] [blame] | 591 | fv = compactor.Compact() |
Fumitoshi Ukai | da7f255 | 2015-04-16 13:33:37 +0900 | [diff] [blame] | 592 | } |
Fumitoshi Ukai | 432a242 | 2015-06-11 15:16:29 +0900 | [diff] [blame] | 593 | if katiEvalStatsFlag || traceEvent.enabled() { |
Fumitoshi Ukai | f543f4d | 2015-06-15 15:21:47 +0900 | [diff] [blame] | 594 | fv = funcstats{ |
| 595 | Value: fv, |
| 596 | str: fv.String(), |
| 597 | } |
| 598 | |
Fumitoshi Ukai | 6ac7f69 | 2015-04-15 17:13:51 +0900 | [diff] [blame] | 599 | } |
Fumitoshi Ukai | 9f6b635 | 2015-04-16 16:25:09 +0900 | [diff] [blame] | 600 | return fv, i, nil |
Fumitoshi Ukai | b36f387 | 2015-04-10 15:06:38 +0900 | [diff] [blame] | 601 | } |
Fumitoshi Ukai | 6ac7f69 | 2015-04-15 17:13:51 +0900 | [diff] [blame] | 602 | |
Fumitoshi Ukai | da7f255 | 2015-04-16 13:33:37 +0900 | [diff] [blame] | 603 | type Compactor interface { |
Fumitoshi Ukai | 9f6b635 | 2015-04-16 16:25:09 +0900 | [diff] [blame] | 604 | Compact() Value |
Fumitoshi Ukai | da7f255 | 2015-04-16 13:33:37 +0900 | [diff] [blame] | 605 | } |
| 606 | |
Fumitoshi Ukai | 6ac7f69 | 2015-04-15 17:13:51 +0900 | [diff] [blame] | 607 | type funcstats struct { |
Fumitoshi Ukai | 9f6b635 | 2015-04-16 16:25:09 +0900 | [diff] [blame] | 608 | Value |
Fumitoshi Ukai | f543f4d | 2015-06-15 15:21:47 +0900 | [diff] [blame] | 609 | str string |
Fumitoshi Ukai | 6ac7f69 | 2015-04-15 17:13:51 +0900 | [diff] [blame] | 610 | } |
| 611 | |
| 612 | func (f funcstats) Eval(w io.Writer, ev *Evaluator) { |
Fumitoshi Ukai | 8341013 | 2015-06-15 14:50:07 +0900 | [diff] [blame] | 613 | te := traceEvent.begin("func", literal(f.str), traceEventMain) |
Fumitoshi Ukai | 9f6b635 | 2015-04-16 16:25:09 +0900 | [diff] [blame] | 614 | f.Value.Eval(w, ev) |
Fumitoshi Ukai | 6ac7f69 | 2015-04-15 17:13:51 +0900 | [diff] [blame] | 615 | // TODO(ukai): per functype? |
Fumitoshi Ukai | 432a242 | 2015-06-11 15:16:29 +0900 | [diff] [blame] | 616 | traceEvent.end(te) |
Fumitoshi Ukai | 6ac7f69 | 2015-04-15 17:13:51 +0900 | [diff] [blame] | 617 | } |
Fumitoshi Ukai | 4a70851 | 2015-06-11 17:15:49 +0900 | [diff] [blame] | 618 | |
| 619 | type matchVarref struct{} |
| 620 | |
| 621 | func (m matchVarref) String() string { return "$(match-any)" } |
| 622 | func (m matchVarref) Eval(w io.Writer, ev *Evaluator) { panic("not implemented") } |
| 623 | func (m matchVarref) Serialize() SerializableVar { panic("not implemented") } |
| 624 | func (m matchVarref) Dump(w io.Writer) { panic("not implemented") } |
| 625 | |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 626 | func matchValue(expr, pat Value) bool { |
| 627 | switch pat := pat.(type) { |
| 628 | case literal: |
| 629 | return literal(expr.String()) == pat |
| 630 | } |
| 631 | // TODO: other type match? |
| 632 | return false |
| 633 | } |
| 634 | |
Fumitoshi Ukai | 4a70851 | 2015-06-11 17:15:49 +0900 | [diff] [blame] | 635 | func matchExpr(expr, pat Expr) ([]Value, bool) { |
| 636 | if len(expr) != len(pat) { |
| 637 | return nil, false |
| 638 | } |
| 639 | var mv matchVarref |
| 640 | var matches []Value |
| 641 | for i := range expr { |
| 642 | if pat[i] == mv { |
| 643 | switch expr[i].(type) { |
| 644 | case paramref, varref: |
| 645 | matches = append(matches, expr[i]) |
| 646 | continue |
| 647 | } |
| 648 | return nil, false |
| 649 | } |
Fumitoshi Ukai | 7c9aa9f | 2015-06-12 23:51:38 +0900 | [diff] [blame^] | 650 | if !matchValue(expr[i], pat[i]) { |
Fumitoshi Ukai | 4a70851 | 2015-06-11 17:15:49 +0900 | [diff] [blame] | 651 | return nil, false |
| 652 | } |
| 653 | } |
| 654 | return matches, true |
| 655 | } |