问题
I made a simple javacc parser to print text in the command prompt:
options
{
static = true;
}
PARSER_BEGIN(Printer)
package test2;
import java.io.*;
public class Printer
{
public static void main(String args []) throws ParseException
{
Printer parser = new Printer(System.in);
parser.parse(System.out);
}
}
PARSER_END(Printer)
SKIP:
{
"\n"
| "\r"
| "\r\n"
}
TOKEN:{
< PRINT: "print" >
| < STR: (["a"-"z"] | ["A"-"Z"])* >
}
void parse(PrintStream ps) :
{
Token t;
}
{
(< PRINT > " " t = < STR >
{
System.out.println(t.image);
})
}
But the problem is that it can not print any characters other than a-z. How do I bring it to print all unicode characters.
回答1:
you need to specify UNICODE_INPUT = true; option in your parser. Also regarding STR token you need to modify your regular expression to detect any text you want.
Hope this helps :)
回答2:
I solved the problem and this is how the code looks now:
options
{
UNICODE_INPUT = true;
static = true;
}
PARSER_BEGIN(Printer)
package test2;
import java.io.*;
public class Printer
{
public static void main(String args []) throws ParseException
{
Printer parser = new Printer(System.in);
parser.parse(System.out);
}
}
PARSER_END(Printer)
SKIP:
{
"\n"
| "\r"
| "\r\n"
}
TOKEN:
{
< PRINT: "print" >
| < STR: (< LETTER >)+>
| < #LETTER:
[ // all chars for which Character.isIdentifierPart is true
"\u0000"-"\u0008",
"\u000e"-"\u001b",
"$",
"0"-"9",
"A"-"Z",
"_",
"a"-"z",
"\u007f"-"\u009f",
"\u00a2"-"\u00a5",
"\u00aa",
"\u00b5",
"\u00ba",
"\u00c0"-"\u00d6",
"\u00d8"-"\u00f6",
"\u00f8"-"\u021f",
"\u0222"-"\u0233",
"\u0250"-"\u02ad",
"\u02b0"-"\u02b8",
"\u02bb"-"\u02c1",
"\u02d0"-"\u02d1",
"\u02e0"-"\u02e4",
"\u02ee",
"\u0300"-"\u034e",
"\u0360"-"\u0362",
"\u037a",
"\u0386",
"\u0388"-"\u038a",
"\u038c",
"\u038e"-"\u03a1",
"\u03a3"-"\u03ce",
"\u03d0"-"\u03d7",
"\u03da"-"\u03f3",
"\u0400"-"\u0481",
"\u0483"-"\u0486",
"\u048c"-"\u04c4",
"\u04c7"-"\u04c8",
"\u04cb"-"\u04cc",
"\u04d0"-"\u04f5",
"\u04f8"-"\u04f9",
"\u0531"-"\u0556",
"\u0559",
"\u0561"-"\u0587",
"\u0591"-"\u05a1",
"\u05a3"-"\u05b9",
"\u05bb"-"\u05bd",
"\u05bf",
"\u05c1"-"\u05c2",
"\u05c4",
"\u05d0"-"\u05ea",
"\u05f0"-"\u05f2",
"\u0621"-"\u063a",
"\u0640"-"\u0655",
"\u0660"-"\u0669",
"\u0670"-"\u06d3",
"\u06d5"-"\u06dc",
"\u06df"-"\u06e8",
"\u06ea"-"\u06ed",
"\u06f0"-"\u06fc",
"\u070f"-"\u072c",
"\u0730"-"\u074a",
"\u0780"-"\u07b0",
"\u0901"-"\u0903",
"\u0905"-"\u0939",
"\u093c"-"\u094d",
"\u0950"-"\u0954",
"\u0958"-"\u0963",
"\u0966"-"\u096f",
"\u0981"-"\u0983",
"\u0985"-"\u098c",
"\u098f"-"\u0990",
"\u0993"-"\u09a8",
"\u09aa"-"\u09b0",
"\u09b2",
"\u09b6"-"\u09b9",
"\u09bc",
"\u09be"-"\u09c4",
"\u09c7"-"\u09c8",
"\u09cb"-"\u09cd",
"\u09d7",
"\u09dc"-"\u09dd",
"\u09df"-"\u09e3",
"\u09e6"-"\u09f3",
"\u0a02",
"\u0a05"-"\u0a0a",
"\u0a0f"-"\u0a10",
"\u0a13"-"\u0a28",
"\u0a2a"-"\u0a30",
"\u0a32"-"\u0a33",
"\u0a35"-"\u0a36",
"\u0a38"-"\u0a39",
"\u0a3c",
"\u0a3e"-"\u0a42",
"\u0a47"-"\u0a48",
"\u0a4b"-"\u0a4d",
"\u0a59"-"\u0a5c",
"\u0a5e",
"\u0a66"-"\u0a74",
"\u0a81"-"\u0a83",
"\u0a85"-"\u0a8b",
"\u0a8d",
"\u0a8f"-"\u0a91",
"\u0a93"-"\u0aa8",
"\u0aaa"-"\u0ab0",
"\u0ab2"-"\u0ab3",
"\u0ab5"-"\u0ab9",
"\u0abc"-"\u0ac5",
"\u0ac7"-"\u0ac9",
"\u0acb"-"\u0acd",
"\u0ad0",
"\u0ae0",
"\u0ae6"-"\u0aef",
"\u0b01"-"\u0b03",
"\u0b05"-"\u0b0c",
"\u0b0f"-"\u0b10",
"\u0b13"-"\u0b28",
"\u0b2a"-"\u0b30",
"\u0b32"-"\u0b33",
"\u0b36"-"\u0b39",
"\u0b3c"-"\u0b43",
"\u0b47"-"\u0b48",
"\u0b4b"-"\u0b4d",
"\u0b56"-"\u0b57",
"\u0b5c"-"\u0b5d",
"\u0b5f"-"\u0b61",
"\u0b66"-"\u0b6f",
"\u0b82"-"\u0b83",
"\u0b85"-"\u0b8a",
"\u0b8e"-"\u0b90",
"\u0b92"-"\u0b95",
"\u0b99"-"\u0b9a",
"\u0b9c",
"\u0b9e"-"\u0b9f",
"\u0ba3"-"\u0ba4",
"\u0ba8"-"\u0baa",
"\u0bae"-"\u0bb5",
"\u0bb7"-"\u0bb9",
"\u0bbe"-"\u0bc2",
"\u0bc6"-"\u0bc8",
"\u0bca"-"\u0bcd",
"\u0bd7",
"\u0be7"-"\u0bef",
"\u0c01"-"\u0c03",
"\u0c05"-"\u0c0c",
"\u0c0e"-"\u0c10",
"\u0c12"-"\u0c28",
"\u0c2a"-"\u0c33",
"\u0c35"-"\u0c39",
"\u0c3e"-"\u0c44",
"\u0c46"-"\u0c48",
"\u0c4a"-"\u0c4d",
"\u0c55"-"\u0c56",
"\u0c60"-"\u0c61",
"\u0c66"-"\u0c6f",
"\u0c82"-"\u0c83",
"\u0c85"-"\u0c8c",
"\u0c8e"-"\u0c90",
"\u0c92"-"\u0ca8",
"\u0caa"-"\u0cb3",
"\u0cb5"-"\u0cb9",
"\u0cbe"-"\u0cc4",
"\u0cc6"-"\u0cc8",
"\u0cca"-"\u0ccd",
"\u0cd5"-"\u0cd6",
"\u0cde",
"\u0ce0"-"\u0ce1",
"\u0ce6"-"\u0cef",
"\u0d02"-"\u0d03",
"\u0d05"-"\u0d0c",
"\u0d0e"-"\u0d10",
"\u0d12"-"\u0d28",
"\u0d2a"-"\u0d39",
"\u0d3e"-"\u0d43",
"\u0d46"-"\u0d48",
"\u0d4a"-"\u0d4d",
"\u0d57",
"\u0d60"-"\u0d61",
"\u0d66"-"\u0d6f",
"\u0d82"-"\u0d83",
"\u0d85"-"\u0d96",
"\u0d9a"-"\u0db1",
"\u0db3"-"\u0dbb",
"\u0dbd",
"\u0dc0"-"\u0dc6",
"\u0dca",
"\u0dcf"-"\u0dd4",
"\u0dd6",
"\u0dd8"-"\u0ddf",
"\u0df2"-"\u0df3",
"\u0e01"-"\u0e3a",
"\u0e3f"-"\u0e4e",
"\u0e50"-"\u0e59",
"\u0e81"-"\u0e82",
"\u0e84",
"\u0e87"-"\u0e88",
"\u0e8a",
"\u0e8d",
"\u0e94"-"\u0e97",
"\u0e99"-"\u0e9f",
"\u0ea1"-"\u0ea3",
"\u0ea5",
"\u0ea7",
"\u0eaa"-"\u0eab",
"\u0ead"-"\u0eb9",
"\u0ebb"-"\u0ebd",
"\u0ec0"-"\u0ec4",
"\u0ec6",
"\u0ec8"-"\u0ecd",
"\u0ed0"-"\u0ed9",
"\u0edc"-"\u0edd",
"\u0f00",
"\u0f18"-"\u0f19",
"\u0f20"-"\u0f29",
"\u0f35",
"\u0f37",
"\u0f39",
"\u0f3e"-"\u0f47",
"\u0f49"-"\u0f6a",
"\u0f71"-"\u0f84",
"\u0f86"-"\u0f8b",
"\u0f90"-"\u0f97",
"\u0f99"-"\u0fbc",
"\u0fc6",
"\u1000"-"\u1021",
"\u1023"-"\u1027",
"\u1029"-"\u102a",
"\u102c"-"\u1032",
"\u1036"-"\u1039",
"\u1040"-"\u1049",
"\u1050"-"\u1059",
"\u10a0"-"\u10c5",
"\u10d0"-"\u10f6",
"\u1100"-"\u1159",
"\u115f"-"\u11a2",
"\u11a8"-"\u11f9",
"\u1200"-"\u1206",
"\u1208"-"\u1246",
"\u1248",
"\u124a"-"\u124d",
"\u1250"-"\u1256",
"\u1258",
"\u125a"-"\u125d",
"\u1260"-"\u1286",
"\u1288",
"\u128a"-"\u128d",
"\u1290"-"\u12ae",
"\u12b0",
"\u12b2"-"\u12b5",
"\u12b8"-"\u12be",
"\u12c0",
"\u12c2"-"\u12c5",
"\u12c8"-"\u12ce",
"\u12d0"-"\u12d6",
"\u12d8"-"\u12ee",
"\u12f0"-"\u130e",
"\u1310",
"\u1312"-"\u1315",
"\u1318"-"\u131e",
"\u1320"-"\u1346",
"\u1348"-"\u135a",
"\u1369"-"\u1371",
"\u13a0"-"\u13f4",
"\u1401"-"\u166c",
"\u166f"-"\u1676",
"\u1681"-"\u169a",
"\u16a0"-"\u16ea",
"\u1780"-"\u17d3",
"\u17db",
"\u17e0"-"\u17e9",
"\u180b"-"\u180e",
"\u1810"-"\u1819",
"\u1820"-"\u1877",
"\u1880"-"\u18a9",
"\u1e00"-"\u1e9b",
"\u1ea0"-"\u1ef9",
"\u1f00"-"\u1f15",
"\u1f18"-"\u1f1d",
"\u1f20"-"\u1f45",
"\u1f48"-"\u1f4d",
"\u1f50"-"\u1f57",
"\u1f59",
"\u1f5b",
"\u1f5d",
"\u1f5f"-"\u1f7d",
"\u1f80"-"\u1fb4",
"\u1fb6"-"\u1fbc",
"\u1fbe",
"\u1fc2"-"\u1fc4",
"\u1fc6"-"\u1fcc",
"\u1fd0"-"\u1fd3",
"\u1fd6"-"\u1fdb",
"\u1fe0"-"\u1fec",
"\u1ff2"-"\u1ff4",
"\u1ff6"-"\u1ffc",
"\u200c"-"\u200f",
"\u202a"-"\u202e",
"\u203f"-"\u2040",
"\u206a"-"\u206f",
"\u207f",
"\u20a0"-"\u20af",
"\u20d0"-"\u20dc",
"\u20e1",
"\u2102",
"\u2107",
"\u210a"-"\u2113",
"\u2115",
"\u2119"-"\u211d",
"\u2124",
"\u2126",
"\u2128",
"\u212a"-"\u212d",
"\u212f"-"\u2131",
"\u2133"-"\u2139",
"\u2160"-"\u2183",
"\u3005"-"\u3007",
"\u3021"-"\u302f",
"\u3031"-"\u3035",
"\u3038"-"\u303a",
"\u3041"-"\u3094",
"\u3099"-"\u309a",
"\u309d"-"\u309e",
"\u30a1"-"\u30fe",
"\u3105"-"\u312c",
"\u3131"-"\u318e",
"\u31a0"-"\u31b7",
"\u3400"-"\u4db5",
"\u4e00"-"\u9fa5",
"\ua000"-"\ua48c",
"\uac00"-"\ud7a3",
"\uf900"-"\ufa2d",
"\ufb00"-"\ufb06",
"\ufb13"-"\ufb17",
"\ufb1d"-"\ufb28",
"\ufb2a"-"\ufb36",
"\ufb38"-"\ufb3c",
"\ufb3e",
"\ufb40"-"\ufb41",
"\ufb43"-"\ufb44",
"\ufb46"-"\ufbb1",
"\ufbd3"-"\ufd3d",
"\ufd50"-"\ufd8f",
"\ufd92"-"\ufdc7",
"\ufdf0"-"\ufdfb",
"\ufe20"-"\ufe23",
"\ufe33"-"\ufe34",
"\ufe4d"-"\ufe4f",
"\ufe69",
"\ufe70"-"\ufe72",
"\ufe74",
"\ufe76"-"\ufefc",
"\ufeff",
"\uff04",
"\uff10"-"\uff19",
"\uff21"-"\uff3a",
"\uff3f",
"\uff41"-"\uff5a",
"\uff65"-"\uffbe",
"\uffc2"-"\uffc7",
"\uffca"-"\uffcf",
"\uffd2"-"\uffd7",
"\uffda"-"\uffdc",
"\uffe0"-"\uffe1",
"\uffe5"-"\uffe6",
"\ufff9"-"\ufffb"
]
>
}
TOKEN:
{
< EQUAL: "=" >
}
void parse(PrintStream ps) :
{
Token t;
}
{
(
< PRINT > " " t = < STR >
{
System.out.println(t.image);
}
)
}
来源：https://stackoverflow.com/questions/9500521/print-in-javacc