CSS1 parser. Will be replaces by MUESLI.

zori/style/css1.go

@@ -0,0 +1,149 @@
+package style
+
+import  "github.com/yhirose/go-peg"    
+import "fmt"
+import "os"
+import "io/ioutil"
+import "errors"
+
+const CSS1PEG = 
+`
+# CSS1 parser for a PEG parser generator.
+# and a user command parser
+# Doesn't support import statements.
+
+
+STYLESHEET      ← (CDO / CDC)*  (RULESET/DECLARATIONS/COMMENT/ATRULE)* (CDO / CDC)*
+RULESET         ← SELECTORS "{" DECLARATIONS? "}"
+SELECTORS       ← SELECTOR ("," SELECTOR)*
+SELECTOR        ← ( "*" / NAME ID? CLASS? PSEUDO_CLASS? /
+                  ID CLASS? PSEUDO_CLASS? /
+                  CLASS PSEUDO_CLASS? /
+                  PSEUDO_CLASS )+ PSEUDO_ELEMENT* / PSEUDO_ELEMENT 
+ATRULE          ← ATID (STRING / URL) ";" / ATID "{" DECLARATIONS "}" 
+NAME            ← <IDENT>
+DECLARATIONS    ← DECLARATION (';' DECLARATION)* ';'?
+DECLARATION     ← NAME ":" EXPR PRIO? / COMMENT 
+OPERATOR        ← '/' / ','
+# UNARY_OPERATOR  ← '-' / '+'
+PRIO            ← IMPORTANT
+EXPR            ← TERM (OPERATOR TERM)*
+TERM            ← STRING / PERCENTAGE / LENGTH / HEXCOLOR / URL / RGB / NUM / IDENT
+~COMMENT        ←  "/*" (!("*/").)* "*/"
+ATID            ← < "@" [a-zA-Z][-_a-zA-Z0-9]+ >
+IMPORTANT       ← < "!" WS "important" >
+IDENT           ← < [-_a-zA-Z][-_a-zA-Z0-9]* >
+PERCENTAGE      ← < NUM > "%"
+NUM             ← < [+-]*[0-9]+ / [0-9]* "." [0-9]+ >
+LENGTH          ← NUM UNIT 
+UNIT            ← <"pt" / "mm" / "pt" / "in" / "px" / "em" / "ex" >
+PSEUDO_ELEMENT  ←  <":first-letter" / ":first-line" >
+PSEUDO_CLASS    ←  <":hover" / ":link" / ":mark" / ":active" / ":visited" >
+HEXCOLOR        ← "#" < ([0-9a-fA-F])+ > 
+ID              ← "#" < IDENT >
+CLASS           ← "." < IDENT >
+
+# Raw string macro.
+RAWSM(O,C)          ← O < (!(C).)* > C
+# Escaped string macro.
+ESCSM(O,C)          ← O < (!(C)STRCHAR)* > C
+# String escapes
+STRESC1      ← "\\" [nrtfv\'\\"\[\]\\]
+STRESC2      ← "\\" [0-3] [0-7] [0-7]
+STRESC3      ← "\\" [0-7] [0-7]*
+STRESC4      ← "\\x" [0-9a-fA-F] [0-9a-fA-F]?
+STRESC5      ← "\\u" [0-9a-fA-F]+
+STRNOESC     ← (!('\\\\').)
+STRCHAR      ←   STRESC1 / STRESC2 / STRESC3 / STRESC4 / STRESC5 / STRNOESC  
+# Strings
+STRING       ← ESCSM("\"", "\"") / ESCSM("'", "'")
+URL                 ← "url(" STRING  ")"
+RGB                 ← < "rgb("[ \t]*[0-9]+[ \t]* "," [ \t]*[0-9]+[ \t]* "," [ \t]*[0-9]+[ \t]*  ")" >
+~WS                 ←   [ \t\n\r]*
+CDO                 ←   "<!--"
+CDC                 ←   "-->"
+%whitespace         ←   [ \t\n\r]*
+`
+
+
+
+type CSS1Parser struct {
+    *peg.Parser
+}
+
+type CSS1Result struct {
+    * peg.Ast
+}
+
+func parserCheck(err error) {
+    if perr, ok := err.(*peg.Error); ok {
+        for _, d := range perr.Details {
+            fmt.Println(d)
+        }
+        os.Exit(1)
+    }
+}
+
+/** Creates a CS1 PEG parser. */
+func NewCSS1Parser() (*CSS1Parser, error) {
+    result := &CSS1Parser{}
+    var err error
+    result.Parser, err = peg.NewParser(CSS1PEG)
+    if err == nil {
+        result.EnableAst()            
+    }
+    return result, err
+}
+
+var defaultCSS1Parser * CSS1Parser
+
+func InitDefaultParser() error {
+    var err error
+    defaultCSS1Parser, err = NewCSS1Parser()
+    return err
+}
+
+func wrapResult(wrapme peg.Any) *CSS1Result {
+    result := &CSS1Result{};
+    ast, ok := wrapme.(*peg.Ast)
+    if ok {
+        result.Ast = ast
+        return result
+    } 
+    return nil    
+}
+
+func (parser CSS1Parser) Parse(source string) (*CSS1Result, error) {
+    ast, err := parser.ParseAndGetValue(source, nil)
+    return wrapResult(ast), err
+}
+
+func (parser CSS1Parser) ParseFile(filename string) (*CSS1Result, error) {    
+    source, err := ioutil.ReadFile(filename)
+    if err == nil {
+        return parser.Parse(string(source))
+    } else {
+        return nil, err
+    }
+}
+
+func (css1 CSS1Result) InitializeTheme(theme * Theme) {
+}
+
+func parse(source string) (*CSS1Result, error) {
+    if defaultCSS1Parser == nil {
+        return nil, errors.New("Default parser not initialized!")
+    }
+    return defaultCSS1Parser.Parse(source)
+}
+
+func parseFile(filename string) (*CSS1Result, error) {
+    if defaultCSS1Parser == nil {
+        return nil, errors.New("Default parser not initialized!")
+    }
+    return defaultCSS1Parser.ParseFile(filename)
+}
+
+
+
+