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token.go
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token.go
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package got
import "fmt"
// Sets up the token map, mapping tokens to items. Allows us to use a variety of different tokens for the
// same tokenItem, including translations
type tokenType int
type locationRef struct {
fileName string
blockName string
lineNum int
offset int
}
type tokenItem struct {
typ tokenType
escaped bool
optional bool
withError bool
translate bool
htmlBreaks bool // adds html break tags in exchange for newlines
val string // filled in by lexer after initialization
callStack []locationRef
childItems []tokenItem // Filled in during the parsing step to build the ast
params map[string]tokenItem // Filled in during the parsing step to build the ast
}
const (
tokEnd = "}}"
tokBegin = "{{"
)
const (
itemEOF tokenType = iota // 0 so that its the default after the channel is closed
itemError
itemStrictBlock
itemNamedBlock
itemEndBlock // ends blocks
itemSubstitute // substitutes a named block
itemInclude // immediately includes another file during lexing
itemEnd
itemGo
itemGoErr
itemText
itemRun // A run of text
itemString
itemBool
itemInt
itemUInt
itemFloat
itemInterface
itemBytes
itemComment
itemIf
itemElse // only used by parser
itemElseIf // only used by parser
itemFor
itemJoin
itemParam
)
var tokens map[string]tokenItem
func init() {
tokens = make(map[string]tokenItem)
tokens["{{!s"] = tokenItem{typ: itemString, escaped: true, withError: false}
tokens["{{!="] = tokenItem{typ: itemString, escaped: true, withError: false}
tokens["{{!h"] = tokenItem{typ: itemString, escaped: true, withError: false, htmlBreaks: true}
tokens["{{!string"] = tokenItem{typ: itemString, escaped: true, withError: false}
tokens["{{="] = tokenItem{typ: itemString, escaped: false, withError: false}
tokens["{{s"] = tokenItem{typ: itemString, escaped: false, withError: false}
tokens["{{string"] = tokenItem{typ: itemString, escaped: false, withError: false}
tokens["{{!se"] = tokenItem{typ: itemString, escaped: true, withError: true}
tokens["{{!=e"] = tokenItem{typ: itemString, escaped: true, withError: true}
tokens["{{!string,err"] = tokenItem{typ: itemString, escaped: true, withError: true}
tokens["{{=e"] = tokenItem{typ: itemString, escaped: false, withError: true}
tokens["{{se"] = tokenItem{typ: itemString, escaped: false, withError: true}
tokens["{{string,err"] = tokenItem{typ: itemString, escaped: false, withError: true}
// It doesn't make sense to html escape booleans, integers, etc
tokens["{{b"] = tokenItem{typ: itemBool, escaped: false, withError: false}
tokens["{{bool"] = tokenItem{typ: itemBool, escaped: false, withError: false}
tokens["{{be"] = tokenItem{typ: itemBool, escaped: false, withError: true}
tokens["{{bool,err"] = tokenItem{typ: itemBool, escaped: false, withError: true}
tokens["{{i"] = tokenItem{typ: itemInt, escaped: false, withError: false}
tokens["{{int"] = tokenItem{typ: itemInt, escaped: false, withError: false}
tokens["{{ie"] = tokenItem{typ: itemInt, escaped: false, withError: true}
tokens["{{int,err"] = tokenItem{typ: itemInt, escaped: false, withError: true}
tokens["{{u"] = tokenItem{typ: itemUInt, escaped: false, withError: false}
tokens["{{uint"] = tokenItem{typ: itemUInt, escaped: false, withError: false}
tokens["{{ue"] = tokenItem{typ: itemUInt, escaped: false, withError: true}
tokens["{{uint,err"] = tokenItem{typ: itemUInt, escaped: false, withError: true}
tokens["{{f"] = tokenItem{typ: itemFloat, escaped: false, withError: false}
tokens["{{float"] = tokenItem{typ: itemFloat, escaped: false, withError: false}
tokens["{{fe"] = tokenItem{typ: itemFloat, escaped: false, withError: true}
tokens["{{float,err"] = tokenItem{typ: itemFloat, escaped: false, withError: true}
tokens["{{!w"] = tokenItem{typ: itemBytes, escaped: true, withError: false}
tokens["{{!bytes"] = tokenItem{typ: itemBytes, escaped: true, withError: false}
tokens["{{w"] = tokenItem{typ: itemBytes, escaped: false, withError: false}
tokens["{{bytes"] = tokenItem{typ: itemBytes, escaped: false, withError: false}
tokens["{{!we"] = tokenItem{typ: itemBytes, escaped: true, withError: true}
tokens["{{!bytes,err"] = tokenItem{typ: itemBytes, escaped: true, withError: true}
tokens["{{we"] = tokenItem{typ: itemBytes, escaped: false, withError: true}
tokens["{{bytes,err"] = tokenItem{typ: itemBytes, escaped: false, withError: true}
tokens["{{!v"] = tokenItem{typ: itemInterface, escaped: true, withError: false}
tokens["{{!stringer"] = tokenItem{typ: itemInterface, escaped: true, withError: false}
tokens["{{v"] = tokenItem{typ: itemInterface, escaped: false, withError: false}
tokens["{{interface"] = tokenItem{typ: itemInterface, escaped: false, withError: false}
tokens["{{!ve"] = tokenItem{typ: itemInterface, escaped: true, withError: true}
tokens["{{!stringer,err"] = tokenItem{typ: itemInterface, escaped: true, withError: true}
tokens["{{ve"] = tokenItem{typ: itemInterface, escaped: false, withError: true}
tokens["{{stringer,err"] = tokenItem{typ: itemInterface, escaped: false, withError: true}
tokens["{{#"] = tokenItem{typ: itemComment}
tokens["{{//"] = tokenItem{typ: itemComment}
tokens["{{"] = tokenItem{typ: itemText, escaped: false, withError: false}
tokens["{{!"] = tokenItem{typ: itemText, escaped: true, withError: false}
tokens["{{esc"] = tokenItem{typ: itemText, escaped: true, withError: false}
tokens["{{h"] = tokenItem{typ: itemText, escaped: true, htmlBreaks: true}
tokens["{{html"] = tokenItem{typ: itemText, escaped: true, htmlBreaks: true}
// go code straight pass through
tokens["{{g"] = tokenItem{typ: itemGo}
tokens["{{go"] = tokenItem{typ: itemGo}
tokens["{{e"] = tokenItem{typ: itemGoErr, withError: true}
tokens["{{err"] = tokenItem{typ: itemGoErr, withError: true}
tokens["{{begin"] = tokenItem{typ: itemStrictBlock}
tokens["{{define"] = tokenItem{typ: itemNamedBlock} // must follow with a name and a close tag
tokens["{{<"] = tokenItem{typ: itemNamedBlock} // must follow with a name and a close tag
tokens["{{>"] = tokenItem{typ: itemSubstitute} // must follow with a name and a close tag
tokens["{{put"] = tokenItem{typ: itemSubstitute} // must follow with a name and a close tag
tokens["{{>?"] = tokenItem{typ: itemSubstitute, optional: true} // must follow with a name and a close tag
tokens["{{put?"] = tokenItem{typ: itemSubstitute, optional: true} // must follow with a name and a close tag
tokens["{{!t"] = tokenItem{typ: itemText, escaped: true, translate: true}
tokens["{{!translate"] = tokenItem{typ: itemText, escaped: true, translate: true}
tokens["{{t"] = tokenItem{typ: itemText, escaped: false, translate: true}
tokens["{{translate"] = tokenItem{typ: itemText, escaped: false, translate: true}
tokens["{{:"] = tokenItem{typ: itemInclude} // must follow with a file name
tokens["{{include"] = tokenItem{typ: itemInclude} // must follow with a file name
tokens["{{:h"] = tokenItem{typ: itemInclude, escaped: true, withError: false, htmlBreaks: true} // must follow with a file name
tokens["{{includeAsHtml"] = tokenItem{typ: itemInclude, escaped: true, withError: false, htmlBreaks: true} // must follow with a file name
tokens["{{:!"] = tokenItem{typ: itemInclude, escaped: true, withError: false, htmlBreaks: false} // must follow with a file name
tokens["{{includeEscaped"] = tokenItem{typ: itemInclude, escaped: true, withError: false, htmlBreaks: false} // must follow with a file name
tokens["{{if"] = tokenItem{typ: itemIf} // Outputs a go "if" statement
tokens["{{if}}"] = tokenItem{typ: itemEndBlock, val: "if"}
tokens["{{elseif"] = tokenItem{typ: itemEndBlock, val: "elseif"}
tokens["{{else}}"] = tokenItem{typ: itemEndBlock, val: "else"}
tokens["{{for"] = tokenItem{typ: itemFor} // Outputs a go "for" statement
tokens["{{for}}"] = tokenItem{typ: itemEndBlock, val: "for"}
tokens["{{join"] = tokenItem{typ: itemJoin} // Like a string.Join statement
tokens["{{join}}"] = tokenItem{typ: itemEndBlock, val: "join"}
tokens["}}"] = tokenItem{typ: itemEnd}
}
func (t tokenItem) formatError() (s string) {
if t.typ == itemError {
s = "*** Error: " + t.val + "\n"
for _, c := range t.callStack {
s += " " + c.formatErrorLine() + "\n"
}
}
return
}
func (r locationRef) formatErrorLine() (s string) {
if r.blockName != "" {
s += fmt.Sprintf("Block %s:%d:%d", r.blockName, r.lineNum+1, r.offset)
} else {
s += fmt.Sprintf("%s:%d:%d", r.fileName, r.lineNum+1, r.offset)
}
return
}