| 1 |
package amber |
| 2 |
|
| 3 |
import ( |
| 4 |
"bytes" |
| 5 |
"container/list" |
| 6 |
"errors" |
| 7 |
"fmt" |
| 8 |
"go/ast" |
| 9 |
gp "go/parser" |
| 10 |
gt "go/token" |
| 11 |
"html/template" |
| 12 |
"io" |
| 13 |
"net/http" |
| 14 |
"os" |
| 15 |
"path/filepath" |
| 16 |
"reflect" |
| 17 |
"regexp" |
| 18 |
"sort" |
| 19 |
"strconv" |
| 20 |
"strings" |
| 21 |
|
| 22 |
"github.com/eknkc/amber/parser" |
| 23 |
) |
| 24 |
|
| 25 |
var builtinFunctions = [...]string{ |
| 26 |
"len", |
| 27 |
"print", |
| 28 |
"printf", |
| 29 |
"println", |
| 30 |
"urlquery", |
| 31 |
"js", |
| 32 |
"json", |
| 33 |
"index", |
| 34 |
"html", |
| 35 |
"unescaped", |
| 36 |
} |
| 37 |
|
| 38 |
const ( |
| 39 |
dollar = "__DOLLAR__" |
| 40 |
) |
| 41 |
|
| 42 |
// Compiler is the main interface of Amber Template Engine. |
| 43 |
// In order to use an Amber template, it is required to create a Compiler and |
| 44 |
// compile an Amber source to native Go template. |
| 45 |
// compiler := amber.New() |
| 46 |
// // Parse the input file |
| 47 |
// err := compiler.ParseFile("./input.amber") |
| 48 |
// if err == nil { |
| 49 |
// // Compile input file to Go template |
| 50 |
// tpl, err := compiler.Compile() |
| 51 |
// if err == nil { |
| 52 |
// // Check built in html/template documentation for further details |
| 53 |
// tpl.Execute(os.Stdout, somedata) |
| 54 |
// } |
| 55 |
// } |
| 56 |
type Compiler struct { |
| 57 |
// Compiler options |
| 58 |
Options |
| 59 |
filename string |
| 60 |
node parser.Node |
| 61 |
indentLevel int |
| 62 |
newline bool |
| 63 |
buffer *bytes.Buffer |
| 64 |
tempvarIndex int |
| 65 |
mixins map[string]*parser.Mixin |
| 66 |
} |
| 67 |
|
| 68 |
// New creates and initialize a new Compiler. |
| 69 |
func New() *Compiler { |
| 70 |
compiler := new(Compiler) |
| 71 |
compiler.filename = "" |
| 72 |
compiler.tempvarIndex = 0 |
| 73 |
compiler.PrettyPrint = true |
| 74 |
compiler.Options = DefaultOptions |
| 75 |
compiler.mixins = make(map[string]*parser.Mixin) |
| 76 |
|
| 77 |
return compiler |
| 78 |
} |
| 79 |
|
| 80 |
// Options defines template output behavior. |
| 81 |
type Options struct { |
| 82 |
// Setting if pretty printing is enabled. |
| 83 |
// Pretty printing ensures that the output html is properly indented and in human readable form. |
| 84 |
// If disabled, produced HTML is compact. This might be more suitable in production environments. |
| 85 |
// Default: true |
| 86 |
PrettyPrint bool |
| 87 |
// Setting if line number emitting is enabled |
| 88 |
// In this form, Amber emits line number comments in the output template. It is usable in debugging environments. |
| 89 |
// Default: false |
| 90 |
LineNumbers bool |
| 91 |
// Setting the virtual filesystem to use |
| 92 |
// If set, will attempt to use a virtual filesystem provided instead of os. |
| 93 |
// Default: nil |
| 94 |
VirtualFilesystem http.FileSystem |
| 95 |
} |
| 96 |
|
| 97 |
// DirOptions is used to provide options to directory compilation. |
| 98 |
type DirOptions struct { |
| 99 |
// File extension to match for compilation |
| 100 |
Ext string |
| 101 |
// Whether or not to walk subdirectories |
| 102 |
Recursive bool |
| 103 |
} |
| 104 |
|
| 105 |
// DefaultOptions sets pretty-printing to true and line numbering to false. |
| 106 |
var DefaultOptions = Options{true, false, nil} |
| 107 |
|
| 108 |
// DefaultDirOptions sets expected file extension to ".amber" and recursive search for templates within a directory to true. |
| 109 |
var DefaultDirOptions = DirOptions{".amber", true} |
| 110 |
|
| 111 |
// Compile parses and compiles the supplied amber template string. Returns corresponding Go Template (html/templates) instance. |
| 112 |
// Necessary runtime functions will be injected and the template will be ready to be executed. |
| 113 |
func Compile(input string, options Options) (*template.Template, error) { |
| 114 |
comp := New() |
| 115 |
comp.Options = options |
| 116 |
|
| 117 |
err := comp.Parse(input) |
| 118 |
if err != nil { |
| 119 |
return nil, err |
| 120 |
} |
| 121 |
|
| 122 |
return comp.Compile() |
| 123 |
} |
| 124 |
|
| 125 |
// Compile parses and compiles the supplied amber template []byte. |
| 126 |
// Returns corresponding Go Template (html/templates) instance. |
| 127 |
// Necessary runtime functions will be injected and the template will be ready to be executed. |
| 128 |
func CompileData(input []byte, filename string, options Options) (*template.Template, error) { |
| 129 |
comp := New() |
| 130 |
comp.Options = options |
| 131 |
|
| 132 |
err := comp.ParseData(input, filename) |
| 133 |
if err != nil { |
| 134 |
return nil, err |
| 135 |
} |
| 136 |
|
| 137 |
return comp.Compile() |
| 138 |
} |
| 139 |
|
| 140 |
// MustCompile is the same as Compile, except the input is assumed error free. If else, panic. |
| 141 |
func MustCompile(input string, options Options) *template.Template { |
| 142 |
t, err := Compile(input, options) |
| 143 |
if err != nil { |
| 144 |
panic(err) |
| 145 |
} |
| 146 |
return t |
| 147 |
} |
| 148 |
|
| 149 |
// CompileFile parses and compiles the contents of supplied filename. Returns corresponding Go Template (html/templates) instance. |
| 150 |
// Necessary runtime functions will be injected and the template will be ready to be executed. |
| 151 |
func CompileFile(filename string, options Options) (*template.Template, error) { |
| 152 |
comp := New() |
| 153 |
comp.Options = options |
| 154 |
|
| 155 |
err := comp.ParseFile(filename) |
| 156 |
if err != nil { |
| 157 |
return nil, err |
| 158 |
} |
| 159 |
|
| 160 |
return comp.Compile() |
| 161 |
} |
| 162 |
|
| 163 |
// MustCompileFile is the same as CompileFile, except the input is assumed error free. If else, panic. |
| 164 |
func MustCompileFile(filename string, options Options) *template.Template { |
| 165 |
t, err := CompileFile(filename, options) |
| 166 |
if err != nil { |
| 167 |
panic(err) |
| 168 |
} |
| 169 |
return t |
| 170 |
} |
| 171 |
|
| 172 |
// CompileDir parses and compiles the contents of a supplied directory path, with options. |
| 173 |
// Returns a map of a template identifier (key) to a Go Template instance. |
| 174 |
// Ex: if the dirname="templates/" had a file "index.amber" the key would be "index" |
| 175 |
// If option for recursive is True, this parses every file of relevant extension |
| 176 |
// in all subdirectories. The key then is the path e.g: "layouts/layout" |
| 177 |
func CompileDir(dirname string, dopt DirOptions, opt Options) (map[string]*template.Template, error) { |
| 178 |
dir, err := os.Open(dirname) |
| 179 |
if err != nil && opt.VirtualFilesystem != nil { |
| 180 |
vdir, err := opt.VirtualFilesystem.Open(dirname) |
| 181 |
if err != nil { |
| 182 |
return nil, err |
| 183 |
} |
| 184 |
dir = vdir.(*os.File) |
| 185 |
} else if err != nil { |
| 186 |
return nil, err |
| 187 |
} |
| 188 |
defer dir.Close() |
| 189 |
|
| 190 |
files, err := dir.Readdir(0) |
| 191 |
if err != nil { |
| 192 |
return nil, err |
| 193 |
} |
| 194 |
|
| 195 |
compiled := make(map[string]*template.Template) |
| 196 |
for _, file := range files { |
| 197 |
// filename is for example "index.amber" |
| 198 |
filename := file.Name() |
| 199 |
fileext := filepath.Ext(filename) |
| 200 |
|
| 201 |
// If recursive is true and there's a subdirectory, recurse |
| 202 |
if dopt.Recursive && file.IsDir() { |
| 203 |
dirpath := filepath.Join(dirname, filename) |
| 204 |
subcompiled, err := CompileDir(dirpath, dopt, opt) |
| 205 |
if err != nil { |
| 206 |
return nil, err |
| 207 |
} |
| 208 |
// Copy templates from subdirectory into parent template mapping |
| 209 |
for k, v := range subcompiled { |
| 210 |
// Concat with parent directory name for unique paths |
| 211 |
key := filepath.Join(filename, k) |
| 212 |
compiled[key] = v |
| 213 |
} |
| 214 |
} else if fileext == dopt.Ext { |
| 215 |
// Otherwise compile the file and add to mapping |
| 216 |
fullpath := filepath.Join(dirname, filename) |
| 217 |
tmpl, err := CompileFile(fullpath, opt) |
| 218 |
if err != nil { |
| 219 |
return nil, err |
| 220 |
} |
| 221 |
// Strip extension |
| 222 |
key := filename[0 : len(filename)-len(fileext)] |
| 223 |
compiled[key] = tmpl |
| 224 |
} |
| 225 |
} |
| 226 |
|
| 227 |
return compiled, nil |
| 228 |
} |
| 229 |
|
| 230 |
// MustCompileDir is the same as CompileDir, except input is assumed error free. If else, panic. |
| 231 |
func MustCompileDir(dirname string, dopt DirOptions, opt Options) map[string]*template.Template { |
| 232 |
m, err := CompileDir(dirname, dopt, opt) |
| 233 |
if err != nil { |
| 234 |
panic(err) |
| 235 |
} |
| 236 |
return m |
| 237 |
} |
| 238 |
|
| 239 |
// Parse given raw amber template string. |
| 240 |
func (c *Compiler) Parse(input string) (err error) { |
| 241 |
defer func() { |
| 242 |
if r := recover(); r != nil { |
| 243 |
err = errors.New(r.(string)) |
| 244 |
} |
| 245 |
}() |
| 246 |
|
| 247 |
parser, err := parser.StringParser(input) |
| 248 |
|
| 249 |
if err != nil { |
| 250 |
return |
| 251 |
} |
| 252 |
|
| 253 |
c.node = parser.Parse() |
| 254 |
return |
| 255 |
} |
| 256 |
|
| 257 |
// Parse given raw amber template bytes, and the filename that belongs with it |
| 258 |
func (c *Compiler) ParseData(input []byte, filename string) (err error) { |
| 259 |
defer func() { |
| 260 |
if r := recover(); r != nil { |
| 261 |
err = errors.New(r.(string)) |
| 262 |
} |
| 263 |
}() |
| 264 |
|
| 265 |
parser, err := parser.ByteParser(input) |
| 266 |
parser.SetFilename(filename) |
| 267 |
if c.VirtualFilesystem != nil { |
| 268 |
parser.SetVirtualFilesystem(c.VirtualFilesystem) |
| 269 |
} |
| 270 |
|
| 271 |
if err != nil { |
| 272 |
return |
| 273 |
} |
| 274 |
|
| 275 |
c.node = parser.Parse() |
| 276 |
return |
| 277 |
} |
| 278 |
|
| 279 |
// ParseFile parses the amber template file in given path. |
| 280 |
func (c *Compiler) ParseFile(filename string) (err error) { |
| 281 |
defer func() { |
| 282 |
if r := recover(); r != nil { |
| 283 |
err = errors.New(r.(string)) |
| 284 |
} |
| 285 |
}() |
| 286 |
|
| 287 |
p, err := parser.FileParser(filename) |
| 288 |
if err != nil && c.VirtualFilesystem != nil { |
| 289 |
p, err = parser.VirtualFileParser(filename, c.VirtualFilesystem) |
| 290 |
} |
| 291 |
if err != nil { |
| 292 |
return |
| 293 |
} |
| 294 |
|
| 295 |
c.node = p.Parse() |
| 296 |
c.filename = filename |
| 297 |
return |
| 298 |
} |
| 299 |
|
| 300 |
// Compile amber and create a Go Template (html/templates) instance. |
| 301 |
// Necessary runtime functions will be injected and the template will be ready to be executed. |
| 302 |
func (c *Compiler) Compile() (*template.Template, error) { |
| 303 |
return c.CompileWithName(filepath.Base(c.filename)) |
| 304 |
} |
| 305 |
|
| 306 |
// CompileWithName is the same as Compile, but allows to specify a name for the template. |
| 307 |
func (c *Compiler) CompileWithName(name string) (*template.Template, error) { |
| 308 |
return c.CompileWithTemplate(template.New(name)) |
| 309 |
} |
| 310 |
|
| 311 |
// CompileWithTemplate is the same as Compile but allows to specify a template. |
| 312 |
func (c *Compiler) CompileWithTemplate(t *template.Template) (*template.Template, error) { |
| 313 |
data, err := c.CompileString() |
| 314 |
|
| 315 |
if err != nil { |
| 316 |
return nil, err |
| 317 |
} |
| 318 |
|
| 319 |
tpl, err := t.Funcs(FuncMap).Parse(data) |
| 320 |
|
| 321 |
if err != nil { |
| 322 |
return nil, err |
| 323 |
} |
| 324 |
|
| 325 |
return tpl, nil |
| 326 |
} |
| 327 |
|
| 328 |
// CompileWriter compiles amber and writes the Go Template source into given io.Writer instance. |
| 329 |
// You would not be using this unless debugging / checking the output. Please use Compile |
| 330 |
// method to obtain a template instance directly. |
| 331 |
func (c *Compiler) CompileWriter(out io.Writer) (err error) { |
| 332 |
defer func() { |
| 333 |
if r := recover(); r != nil { |
| 334 |
err = errors.New(r.(string)) |
| 335 |
} |
| 336 |
}() |
| 337 |
|
| 338 |
c.buffer = new(bytes.Buffer) |
| 339 |
c.visit(c.node) |
| 340 |
|
| 341 |
if c.buffer.Len() > 0 { |
| 342 |
c.write("\n") |
| 343 |
} |
| 344 |
|
| 345 |
_, err = c.buffer.WriteTo(out) |
| 346 |
return |
| 347 |
} |
| 348 |
|
| 349 |
// CompileString compiles the template and returns the Go Template source. |
| 350 |
// You would not be using this unless debugging / checking the output. Please use Compile |
| 351 |
// method to obtain a template instance directly. |
| 352 |
func (c *Compiler) CompileString() (string, error) { |
| 353 |
var buf bytes.Buffer |
| 354 |
|
| 355 |
if err := c.CompileWriter(&buf); err != nil { |
| 356 |
return "", err |
| 357 |
} |
| 358 |
|
| 359 |
result := buf.String() |
| 360 |
|
| 361 |
return result, nil |
| 362 |
} |
| 363 |
|
| 364 |
func (c *Compiler) visit(node parser.Node) { |
| 365 |
defer func() { |
| 366 |
if r := recover(); r != nil { |
| 367 |
if rs, ok := r.(string); ok && rs[:len("Amber Error")] == "Amber Error" { |
| 368 |
panic(r) |
| 369 |
} |
| 370 |
|
| 371 |
pos := node.Pos() |
| 372 |
|
| 373 |
if len(pos.Filename) > 0 { |
| 374 |
panic(fmt.Sprintf("Amber Error in <%s>: %v - Line: %d, Column: %d, Length: %d", pos.Filename, r, pos.LineNum, pos.ColNum, pos.TokenLength)) |
| 375 |
} else { |
| 376 |
panic(fmt.Sprintf("Amber Error: %v - Line: %d, Column: %d, Length: %d", r, pos.LineNum, pos.ColNum, pos.TokenLength)) |
| 377 |
} |
| 378 |
} |
| 379 |
}() |
| 380 |
|
| 381 |
switch node.(type) { |
| 382 |
case *parser.Block: |
| 383 |
c.visitBlock(node.(*parser.Block)) |
| 384 |
case *parser.Doctype: |
| 385 |
c.visitDoctype(node.(*parser.Doctype)) |
| 386 |
case *parser.Comment: |
| 387 |
c.visitComment(node.(*parser.Comment)) |
| 388 |
case *parser.Tag: |
| 389 |
c.visitTag(node.(*parser.Tag)) |
| 390 |
case *parser.Text: |
| 391 |
c.visitText(node.(*parser.Text)) |
| 392 |
case *parser.Condition: |
| 393 |
c.visitCondition(node.(*parser.Condition)) |
| 394 |
case *parser.Each: |
| 395 |
c.visitEach(node.(*parser.Each)) |
| 396 |
case *parser.Assignment: |
| 397 |
c.visitAssignment(node.(*parser.Assignment)) |
| 398 |
case *parser.Mixin: |
| 399 |
c.visitMixin(node.(*parser.Mixin)) |
| 400 |
case *parser.MixinCall: |
| 401 |
c.visitMixinCall(node.(*parser.MixinCall)) |
| 402 |
} |
| 403 |
} |
| 404 |
|
| 405 |
func (c *Compiler) write(value string) { |
| 406 |
c.buffer.WriteString(value) |
| 407 |
} |
| 408 |
|
| 409 |
func (c *Compiler) indent(offset int, newline bool) { |
| 410 |
if !c.PrettyPrint { |
| 411 |
return |
| 412 |
} |
| 413 |
|
| 414 |
if newline && c.buffer.Len() > 0 { |
| 415 |
c.write("\n") |
| 416 |
} |
| 417 |
|
| 418 |
for i := 0; i < c.indentLevel+offset; i++ { |
| 419 |
c.write("\t") |
| 420 |
} |
| 421 |
} |
| 422 |
|
| 423 |
func (c *Compiler) tempvar() string { |
| 424 |
c.tempvarIndex++ |
| 425 |
return "$__amber_" + strconv.Itoa(c.tempvarIndex) |
| 426 |
} |
| 427 |
|
| 428 |
func (c *Compiler) escape(input string) string { |
| 429 |
return strings.Replace(strings.Replace(input, `\`, `\\`, -1), `"`, `\"`, -1) |
| 430 |
} |
| 431 |
|
| 432 |
func (c *Compiler) visitBlock(block *parser.Block) { |
| 433 |
for _, node := range block.Children { |
| 434 |
if _, ok := node.(*parser.Text); !block.CanInline() && ok { |
| 435 |
c.indent(0, true) |
| 436 |
} |
| 437 |
|
| 438 |
c.visit(node) |
| 439 |
} |
| 440 |
} |
| 441 |
|
| 442 |
func (c *Compiler) visitDoctype(doctype *parser.Doctype) { |
| 443 |
c.write(doctype.String()) |
| 444 |
} |
| 445 |
|
| 446 |
func (c *Compiler) visitComment(comment *parser.Comment) { |
| 447 |
if comment.Silent { |
| 448 |
return |
| 449 |
} |
| 450 |
|
| 451 |
c.indent(0, false) |
| 452 |
|
| 453 |
if comment.Block == nil { |
| 454 |
c.write(`{{unescaped "<!-- ` + c.escape(comment.Value) + ` -->"}}`) |
| 455 |
} else { |
| 456 |
c.write(`<!-- ` + comment.Value) |
| 457 |
c.visitBlock(comment.Block) |
| 458 |
c.write(` -->`) |
| 459 |
} |
| 460 |
} |
| 461 |
|
| 462 |
func (c *Compiler) visitCondition(condition *parser.Condition) { |
| 463 |
c.write(`{{if ` + c.visitRawInterpolation(condition.Expression) + `}}`) |
| 464 |
c.visitBlock(condition.Positive) |
| 465 |
if condition.Negative != nil { |
| 466 |
c.write(`{{else}}`) |
| 467 |
c.visitBlock(condition.Negative) |
| 468 |
} |
| 469 |
c.write(`{{end}}`) |
| 470 |
} |
| 471 |
|
| 472 |
func (c *Compiler) visitEach(each *parser.Each) { |
| 473 |
if each.Block == nil { |
| 474 |
return |
| 475 |
} |
| 476 |
|
| 477 |
if len(each.Y) == 0 { |
| 478 |
c.write(`{{range ` + each.X + ` := ` + c.visitRawInterpolation(each.Expression) + `}}`) |
| 479 |
} else { |
| 480 |
c.write(`{{range ` + each.X + `, ` + each.Y + ` := ` + c.visitRawInterpolation(each.Expression) + `}}`) |
| 481 |
} |
| 482 |
c.visitBlock(each.Block) |
| 483 |
c.write(`{{end}}`) |
| 484 |
} |
| 485 |
|
| 486 |
func (c *Compiler) visitAssignment(assgn *parser.Assignment) { |
| 487 |
c.write(`{{` + assgn.X + ` := ` + c.visitRawInterpolation(assgn.Expression) + `}}`) |
| 488 |
} |
| 489 |
|
| 490 |
func (c *Compiler) visitTag(tag *parser.Tag) { |
| 491 |
type attrib struct { |
| 492 |
name string |
| 493 |
value func() string |
| 494 |
condition string |
| 495 |
} |
| 496 |
|
| 497 |
attribs := make(map[string]*attrib) |
| 498 |
|
| 499 |
for _, item := range tag.Attributes { |
| 500 |
attritem := item |
| 501 |
attr := new(attrib) |
| 502 |
attr.name = item.Name |
| 503 |
|
| 504 |
attr.value = func() string { |
| 505 |
if !attritem.IsRaw { |
| 506 |
return c.visitInterpolation(attritem.Value) |
| 507 |
} else if attritem.Value == "" { |
| 508 |
return "" |
| 509 |
} else { |
| 510 |
return attritem.Value |
| 511 |
} |
| 512 |
} |
| 513 |
|
| 514 |
if len(attritem.Condition) != 0 { |
| 515 |
attr.condition = c.visitRawInterpolation(attritem.Condition) |
| 516 |
} |
| 517 |
|
| 518 |
if attr.name == "class" && attribs["class"] != nil { |
| 519 |
prevclass := attribs["class"] |
| 520 |
prevvalue := prevclass.value |
| 521 |
|
| 522 |
prevclass.value = func() string { |
| 523 |
aval := attr.value() |
| 524 |
|
| 525 |
if len(attr.condition) > 0 { |
| 526 |
aval = `{{if ` + attr.condition + `}}` + aval + `{{end}}` |
| 527 |
} |
| 528 |
|
| 529 |
if len(prevclass.condition) > 0 { |
| 530 |
return `{{if ` + prevclass.condition + `}}` + prevvalue() + `{{end}} ` + aval |
| 531 |
} |
| 532 |
|
| 533 |
return prevvalue() + " " + aval |
| 534 |
} |
| 535 |
} else { |
| 536 |
attribs[attritem.Name] = attr |
| 537 |
} |
| 538 |
} |
| 539 |
|
| 540 |
keys := make([]string, 0, len(attribs)) |
| 541 |
for key := range attribs { |
| 542 |
keys = append(keys, key) |
| 543 |
} |
| 544 |
sort.Strings(keys) |
| 545 |
|
| 546 |
c.indent(0, true) |
| 547 |
c.write("<" + tag.Name) |
| 548 |
|
| 549 |
for _, name := range keys { |
| 550 |
value := attribs[name] |
| 551 |
|
| 552 |
if len(value.condition) > 0 { |
| 553 |
c.write(`{{if ` + value.condition + `}}`) |
| 554 |
} |
| 555 |
|
| 556 |
val := value.value() |
| 557 |
|
| 558 |
if val == "" { |
| 559 |
c.write(` ` + name) |
| 560 |
} else { |
| 561 |
c.write(` ` + name + `="` + val + `"`) |
| 562 |
} |
| 563 |
|
| 564 |
if len(value.condition) > 0 { |
| 565 |
c.write(`{{end}}`) |
| 566 |
} |
| 567 |
} |
| 568 |
|
| 569 |
if tag.IsSelfClosing() { |
| 570 |
c.write(` />`) |
| 571 |
} else { |
| 572 |
c.write(`>`) |
| 573 |
|
| 574 |
if tag.Block != nil { |
| 575 |
if !tag.Block.CanInline() { |
| 576 |
c.indentLevel++ |
| 577 |
} |
| 578 |
|
| 579 |
c.visitBlock(tag.Block) |
| 580 |
|
| 581 |
if !tag.Block.CanInline() { |
| 582 |
c.indentLevel-- |
| 583 |
c.indent(0, true) |
| 584 |
} |
| 585 |
} |
| 586 |
|
| 587 |
c.write(`</` + tag.Name + `>`) |
| 588 |
} |
| 589 |
} |
| 590 |
|
| 591 |
var textInterpolateRegexp = regexp.MustCompile(`#\{(.*?)\}`) |
| 592 |
var textEscapeRegexp = regexp.MustCompile(`\{\{(.*?)\}\}`) |
| 593 |
|
| 594 |
func (c *Compiler) visitText(txt *parser.Text) { |
| 595 |
value := textEscapeRegexp.ReplaceAllStringFunc(txt.Value, func(value string) string { |
| 596 |
return `{{"{{"}}` + value[2:len(value)-2] + `{{"}}"}}` |
| 597 |
}) |
| 598 |
|
| 599 |
value = textInterpolateRegexp.ReplaceAllStringFunc(value, func(value string) string { |
| 600 |
return c.visitInterpolation(value[2 : len(value)-1]) |
| 601 |
}) |
| 602 |
|
| 603 |
lines := strings.Split(value, "\n") |
| 604 |
for i := 0; i < len(lines); i++ { |
| 605 |
c.write(lines[i]) |
| 606 |
|
| 607 |
if i < len(lines)-1 { |
| 608 |
c.write("\n") |
| 609 |
c.indent(0, false) |
| 610 |
} |
| 611 |
} |
| 612 |
} |
| 613 |
|
| 614 |
func (c *Compiler) visitInterpolation(value string) string { |
| 615 |
return `{{` + c.visitRawInterpolation(value) + `}}` |
| 616 |
} |
| 617 |
|
| 618 |
func (c *Compiler) visitRawInterpolation(value string) string { |
| 619 |
if value == "" { |
| 620 |
value = "\"\"" |
| 621 |
} |
| 622 |
|
| 623 |
value = strings.Replace(value, "$", dollar, -1) |
| 624 |
expr, err := gp.ParseExpr(value) |
| 625 |
if err != nil { |
| 626 |
panic("Unable to parse expression.") |
| 627 |
} |
| 628 |
value = strings.Replace(c.visitExpression(expr), dollar, "$", -1) |
| 629 |
return value |
| 630 |
} |
| 631 |
|
| 632 |
func (c *Compiler) visitExpression(outerexpr ast.Expr) string { |
| 633 |
stack := list.New() |
| 634 |
|
| 635 |
pop := func() string { |
| 636 |
if stack.Front() == nil { |
| 637 |
return "" |
| 638 |
} |
| 639 |
|
| 640 |
val := stack.Front().Value.(string) |
| 641 |
stack.Remove(stack.Front()) |
| 642 |
return val |
| 643 |
} |
| 644 |
|
| 645 |
var exec func(ast.Expr) |
| 646 |
|
| 647 |
exec = func(expr ast.Expr) { |
| 648 |
switch expr := expr.(type) { |
| 649 |
case *ast.BinaryExpr: |
| 650 |
{ |
| 651 |
be := expr |
| 652 |
|
| 653 |
exec(be.Y) |
| 654 |
exec(be.X) |
| 655 |
|
| 656 |
negate := false |
| 657 |
name := c.tempvar() |
| 658 |
c.write(`{{` + name + ` := `) |
| 659 |
|
| 660 |
switch be.Op { |
| 661 |
case gt.ADD: |
| 662 |
c.write("__amber_add ") |
| 663 |
case gt.SUB: |
| 664 |
c.write("__amber_sub ") |
| 665 |
case gt.MUL: |
| 666 |
c.write("__amber_mul ") |
| 667 |
case gt.QUO: |
| 668 |
c.write("__amber_quo ") |
| 669 |
case gt.REM: |
| 670 |
c.write("__amber_rem ") |
| 671 |
case gt.LAND: |
| 672 |
c.write("and ") |
| 673 |
case gt.LOR: |
| 674 |
c.write("or ") |
| 675 |
case gt.EQL: |
| 676 |
c.write("__amber_eql ") |
| 677 |
case gt.NEQ: |
| 678 |
c.write("__amber_eql ") |
| 679 |
negate = true |
| 680 |
case gt.LSS: |
| 681 |
c.write("__amber_lss ") |
| 682 |
case gt.GTR: |
| 683 |
c.write("__amber_gtr ") |
| 684 |
case gt.LEQ: |
| 685 |
c.write("__amber_gtr ") |
| 686 |
negate = true |
| 687 |
case gt.GEQ: |
| 688 |
c.write("__amber_lss ") |
| 689 |
negate = true |
| 690 |
default: |
| 691 |
panic("Unexpected operator!") |
| 692 |
} |
| 693 |
|
| 694 |
c.write(pop() + ` ` + pop() + `}}`) |
| 695 |
|
| 696 |
if !negate { |
| 697 |
stack.PushFront(name) |
| 698 |
} else { |
| 699 |
negname := c.tempvar() |
| 700 |
c.write(`{{` + negname + ` := not ` + name + `}}`) |
| 701 |
stack.PushFront(negname) |
| 702 |
} |
| 703 |
} |
| 704 |
case *ast.UnaryExpr: |
| 705 |
{ |
| 706 |
ue := expr |
| 707 |
|
| 708 |
exec(ue.X) |
| 709 |
|
| 710 |
name := c.tempvar() |
| 711 |
c.write(`{{` + name + ` := `) |
| 712 |
|
| 713 |
switch ue.Op { |
| 714 |
case gt.SUB: |
| 715 |
c.write("__amber_minus ") |
| 716 |
case gt.ADD: |
| 717 |
c.write("__amber_plus ") |
| 718 |
case gt.NOT: |
| 719 |
c.write("not ") |
| 720 |
default: |
| 721 |
panic("Unexpected operator!") |
| 722 |
} |
| 723 |
|
| 724 |
c.write(pop() + `}}`) |
| 725 |
stack.PushFront(name) |
| 726 |
} |
| 727 |
case *ast.ParenExpr: |
| 728 |
exec(expr.X) |
| 729 |
case *ast.BasicLit: |
| 730 |
stack.PushFront(strings.Replace(expr.Value, dollar, "$", -1)) |
| 731 |
case *ast.Ident: |
| 732 |
name := expr.Name |
| 733 |
if len(name) >= len(dollar) && name[:len(dollar)] == dollar { |
| 734 |
if name == dollar { |
| 735 |
stack.PushFront(`.`) |
| 736 |
} else { |
| 737 |
stack.PushFront(`$` + expr.Name[len(dollar):]) |
| 738 |
} |
| 739 |
} else { |
| 740 |
stack.PushFront(`.` + expr.Name) |
| 741 |
} |
| 742 |
case *ast.SelectorExpr: |
| 743 |
se := expr |
| 744 |
exec(se.X) |
| 745 |
x := pop() |
| 746 |
|
| 747 |
if x == "." { |
| 748 |
x = "" |
| 749 |
} |
| 750 |
|
| 751 |
name := c.tempvar() |
| 752 |
c.write(`{{` + name + ` := ` + x + `.` + se.Sel.Name + `}}`) |
| 753 |
stack.PushFront(name) |
| 754 |
case *ast.CallExpr: |
| 755 |
ce := expr |
| 756 |
|
| 757 |
for i := len(ce.Args) - 1; i >= 0; i-- { |
| 758 |
exec(ce.Args[i]) |
| 759 |
} |
| 760 |
|
| 761 |
name := c.tempvar() |
| 762 |
builtin := false |
| 763 |
|
| 764 |
if ident, ok := ce.Fun.(*ast.Ident); ok { |
| 765 |
for _, fname := range builtinFunctions { |
| 766 |
if fname == ident.Name { |
| 767 |
builtin = true |
| 768 |
break |
| 769 |
} |
| 770 |
} |
| 771 |
for fname, _ := range FuncMap { |
| 772 |
if fname == ident.Name { |
| 773 |
builtin = true |
| 774 |
break |
| 775 |
} |
| 776 |
} |
| 777 |
} |
| 778 |
|
| 779 |
if builtin { |
| 780 |
stack.PushFront(ce.Fun.(*ast.Ident).Name) |
| 781 |
c.write(`{{` + name + ` := ` + pop()) |
| 782 |
} else if se, ok := ce.Fun.(*ast.SelectorExpr); ok { |
| 783 |
exec(se.X) |
| 784 |
x := pop() |
| 785 |
|
| 786 |
if x == "." { |
| 787 |
x = "" |
| 788 |
} |
| 789 |
stack.PushFront(se.Sel.Name) |
| 790 |
c.write(`{{` + name + ` := ` + x + `.` + pop()) |
| 791 |
} else { |
| 792 |
exec(ce.Fun) |
| 793 |
c.write(`{{` + name + ` := call ` + pop()) |
| 794 |
} |
| 795 |
|
| 796 |
for i := 0; i < len(ce.Args); i++ { |
| 797 |
c.write(` `) |
| 798 |
c.write(pop()) |
| 799 |
} |
| 800 |
|
| 801 |
c.write(`}}`) |
| 802 |
|
| 803 |
stack.PushFront(name) |
| 804 |
default: |
| 805 |
panic("Unable to parse expression. Unsupported: " + reflect.TypeOf(expr).String()) |
| 806 |
} |
| 807 |
} |
| 808 |
|
| 809 |
exec(outerexpr) |
| 810 |
return pop() |
| 811 |
} |
| 812 |
|
| 813 |
func (c *Compiler) visitMixin(mixin *parser.Mixin) { |
| 814 |
c.mixins[mixin.Name] = mixin |
| 815 |
} |
| 816 |
|
| 817 |
func (c *Compiler) visitMixinCall(mixinCall *parser.MixinCall) { |
| 818 |
mixin := c.mixins[mixinCall.Name] |
| 819 |
|
| 820 |
switch { |
| 821 |
case mixin == nil: |
| 822 |
panic(fmt.Sprintf("unknown mixin %q", mixinCall.Name)) |
| 823 |
|
| 824 |
case len(mixinCall.Args) < len(mixin.Args): |
| 825 |
panic(fmt.Sprintf( |
| 826 |
"not enough arguments in call to mixin %q (have: %d, want: %d)", |
| 827 |
mixinCall.Name, |
| 828 |
len(mixinCall.Args), |
| 829 |
len(mixin.Args), |
| 830 |
)) |
| 831 |
case len(mixinCall.Args) > len(mixin.Args): |
| 832 |
panic(fmt.Sprintf( |
| 833 |
"too many arguments in call to mixin %q (have: %d, want: %d)", |
| 834 |
mixinCall.Name, |
| 835 |
len(mixinCall.Args), |
| 836 |
len(mixin.Args), |
| 837 |
)) |
| 838 |
} |
| 839 |
|
| 840 |
for i, arg := range mixin.Args { |
| 841 |
c.write(fmt.Sprintf(`{{%s := %s}}`, arg, c.visitRawInterpolation(mixinCall.Args[i]))) |
| 842 |
} |
| 843 |
c.visitBlock(mixin.Block) |
| 844 |
} |
