Name
Unisyn::Parse - Parse a Unisyn expression.
Synopsis
Parse the Unisyn expression:
𝒂 ❴ 𝒃 ⟦𝒄⟨ 𝗮 𝑒𝑞𝑢𝑎𝑙𝑠 𝒅 𝗯 𝙙 𝐭𝐢𝐦𝐞𝐬 ⟪𝗰 𝐩𝐥𝐮𝐬 𝗱⟫⟢ 𝗲 𝑎𝑠𝑠𝑖𝑔𝑛 𝗳 𝐬𝐮𝐛 𝗴 𝙝⟩ 𝙘 ⟧ 𝙗 ❵ 𝙖To get:
Suffix: 𝙖
Term
Prefix: 𝒂
Term
Brackets: ⦇⦈
Term
Term
Suffix: 𝙗
Term
Prefix: 𝒃
Term
Brackets: ⦋⦌
Term
Term
Suffix: 𝙘
Term
Prefix: 𝒄
Term
Brackets: ⦏⦐
Term
Term
Semicolon
Term
Assign: 𝑒𝑞𝑢𝑎𝑙𝑠
Term
Variable: 𝗮
Term
Dyad: 𝐭𝐢𝐦𝐞𝐬
Term
Suffix: 𝙙
Term
Prefix: 𝒅
Term
Variable: 𝗯
Term
Brackets: ⦓⦔
Term
Term
Dyad: 𝐩𝐥𝐮𝐬
Term
Variable: 𝗰
Term
Variable: 𝗱
Term
Assign: 𝑎𝑠𝑠𝑖𝑔𝑛
Term
Variable: 𝗲
Term
Dyad: 𝐬𝐮𝐛
Term
Variable: 𝗳
Term
Suffix: 𝙝
Term
Variable: 𝗴Then traverse the parse tree printing the type of each node:
variable
variable
prefix_d
suffix_d
variable
variable
plus
times
equals
variable
variable
variable
sub
assign
semiColon
brackets_3
prefix_c
suffix_c
brackets_2
prefix_b
suffix_b
brackets_1
prefix_a
suffix_aDescription
Parse a Unisyn expression.
Version "20210927".
The following sections describe the methods in each functional area of this module. For an alphabetic listing of all methods by name see Index.
Create
Create a Unisyn parse of a utf8 string.
create($address, %options)
Create a new unisyn parse from a utf8 string.
Parameter Description
1 $address Address of a zero terminated utf8 source string to parse as a variable
2 %options Parse options.Example:
create (K(address, Rutf8 $Lex->{sampleText}{vav}))->print; # Create parse tree from source terminated with zero # 𝗘𝘅𝗮𝗺𝗽𝗹𝗲
ok Assemble(debug => 0, eq => <<END);
Assign: 𝑎
Term
Variable: 𝗮
Term
Variable: 𝗯
ENDParse
Parse Unisyn expressions
Traverse
Traverse the parse tree
traverseParseTree($parse)
Traverse the terms in parse tree in post order and call the operator subroutine associated with each term.
Parameter Description
1 $parse Parse treeExample:
my $s = Rutf8 $Lex->{sampleText}{Adv}; # Ascii
my $p = create K(address, $s), operators => \&printOperatorSequence;
K(address, $s)->printOutZeroString;
# $p->dumpParseTree;
$p->print;
$p->traverseParseTree; # 𝗘𝘅𝗮𝗺𝗽𝗹𝗲
Assemble(debug => 0, eq => <<END)
𝗮𝗮𝑒𝑞𝑢𝑎𝑙𝑠abc 123 𝐩𝐥𝐮𝐬𝘃𝗮𝗿
Assign: 𝑒𝑞𝑢𝑎𝑙𝑠
Term
Variable: 𝗮𝗮
Term
Dyad: 𝐩𝐥𝐮𝐬
Term
Ascii: abc 123
Term
Variable: 𝘃𝗮𝗿
variable
ascii
variable
plus
equals
END
my $s = Rutf8 $Lex->{sampleText}{ws};
my $p = create (K(address, $s), operators => \&printOperatorSequence);
K(address, $s)->printOutZeroString; # Print input string
$p->print; # Print parse
$p->traverseParseTree; # Traverse tree printing terms # 𝗘𝘅𝗮𝗺𝗽𝗹𝗲
Assemble(debug => 0, eq => <<END)
𝗮𝑎𝑠𝑠𝑖𝑔𝑛⌊⟨❨𝗯𝗽❩⟩𝐩𝐥𝐮𝐬❪𝘀𝗰❫⌋⟢𝗮𝗮𝑎𝑠𝑠𝑖𝑔𝑛❬𝗯𝗯𝐩𝐥𝐮𝐬𝗰𝗰❭⟢
Semicolon
Term
Assign: 𝑎𝑠𝑠𝑖𝑔𝑛
Term
Variable: 𝗮
Term
Brackets: ⌊⌋
Term
Term
Dyad: 𝐩𝐥𝐮𝐬
Term
Brackets: ❨❩
Term
Term
Brackets: ❬❭
Term
Term
Variable: 𝗯𝗽
Term
Brackets: ❰❱
Term
Term
Variable: 𝘀𝗰
Term
Assign: 𝑎𝑠𝑠𝑖𝑔𝑛
Term
Variable: 𝗮𝗮
Term
Brackets: ❴❵
Term
Term
Dyad: 𝐩𝐥𝐮𝐬
Term
Variable: 𝗯𝗯
Term
Variable: 𝗰𝗰
variable
variable
variable
plus
assign
variable
variable
variable
plus
assign
semiColon
ENDPrint a parse tree
print($parse)
Print a parse tree.
Parameter Description
1 $parse Parse treeExample:
create (K(address, Rutf8 $Lex->{sampleText}{vav}))->print; # Create parse tree from source terminated with zero # 𝗘𝘅𝗮𝗺𝗽𝗹𝗲
ok Assemble(debug => 0, eq => <<END);
Assign: 𝑎
Term
Variable: 𝗮
Term
Variable: 𝗯
ENDdumpParseTree($parse)
Dump the parse tree.
Parameter Description
1 $parse Parse treeExecute
Associate methods with each operator via a set of quarks describing the method to be called for each lexical operator.
lexToSub($parse, $alphabet, $op, $sub)
Map a lexical item to a processing subroutine.
Parameter Description
1 $parse Sub quarks
2 $alphabet The alphabet number
3 $op The operator name in that alphabet
4 $sub Subroutine definitiondyad($parse, $text, $sub)
Define a method for a dyadic operator.
Parameter Description
1 $parse Sub quarks
2 $text The name of the operator as a utf8 string
3 $sub Associated subroutine definitionassign($parse, $text, $sub)
Define a method for an assign operator.
Parameter Description
1 $parse Sub quarks
2 $text The name of the operator as a utf8 string
3 $sub Associated subroutine definitionprefix($parse, $text, $sub)
Define a method for a prefix operator.
Parameter Description
1 $parse Sub quarks
2 $text The name of the operator as a utf8 string
3 $sub Associated subroutine definitionsuffix($parse, $text, $sub)
Define a method for a suffix operator.
Parameter Description
1 $parse Sub quarks
2 $text The name of the operator as a utf8 string
3 $sub Associated subroutine definitionascii($parse, $sub)
Define a method for ascii text.
Parameter Description
1 $parse Sub quarks
2 $sub Associated subroutine definitionsemiColon($parse, $sub)
Define a method for the semicolon operator.
Parameter Description
1 $parse Sub quarks
2 $sub Associated subroutine definitionvariable($parse, $sub)
Define a method for a variable.
Parameter Description
1 $parse Sub quarks
2 $sub Associated subroutine definitionbracket($parse, $open, $sub)
Define a method for a bracket operator.
Parameter Description
1 $parse Sub quarks
2 $open Opening parenthesis
3 $sub Associated subroutineAlphabets
Translate between alphabets.
asciiToAssignLatin($in)
Translate ascii to the corresponding letters in the assign latin alphabet.
Parameter Description
1 $in A string of asciiasciiToAssignGreek($in)
Translate ascii to the corresponding letters in the assign greek alphabet.
Parameter Description
1 $in A string of asciiasciiToDyadLatin($in)
Translate ascii to the corresponding letters in the dyad latin alphabet.
Parameter Description
1 $in A string of asciiasciiToDyadGreek($in)
Translate ascii to the corresponding letters in the dyad greek alphabet.
Parameter Description
1 $in A string of asciiasciiToPrefixLatin($in)
Translate ascii to the corresponding letters in the prefix latin alphabet.
Parameter Description
1 $in A string of asciiasciiToPrefixGreek($in)
Translate ascii to the corresponding letters in the prefix greek alphabet.
Parameter Description
1 $in A string of asciiasciiToSuffixLatin($in)
Translate ascii to the corresponding letters in the suffix latin alphabet.
Parameter Description
1 $in A string of asciiasciiToSuffixGreek($in)
Translate ascii to the corresponding letters in the suffix greek alphabet.
Parameter Description
1 $in A string of asciiasciiToVariableLatin($in)
Translate ascii to the corresponding letters in the suffix latin alphabet.
Parameter Description
1 $in A string of asciiasciiToVariableGreek($in)
Translate ascii to the corresponding letters in the suffix greek alphabet.
Parameter Description
1 $in A string of asciiasciiToEscaped($in)
Translate ascii to the corresponding letters in the escaped ascii alphabet.
Parameter Description
1 $in A string of asciisemiColonChar()
Translate ascii to the corresponding letters in the escaped ascii alphabet.
printOperatorSequence($parse)
Print the operator calling sequence.
Parameter Description
1 $parse ParseHash Definitions
Unisyn::Parse Definition
Description of parse
Output fields
address8
Address of source string as utf8
arena
Arena containing tree
fails
Number of failures encountered in this parse
operators
Methods implementing each lexical operator
parse
Offset to the head of the parse tree
quarks
Quarks representing the strings used in this parse
size8
Size of source string as utf8
source32
Source text as utf32
sourceLength32
Length of utf32 string
sourceSize32
Size of utf32 allocation
Private Methods
getAlpha($register, $address, $index)
Load the position of a lexical item in its alphabet from the current character.
Parameter Description
1 $register Register to load
2 $address Address of start of string
3 $index Index into stringgetLexicalCode($register, $address, $index)
Load the lexical code of the current character in memory into the specified register.
Parameter Description
1 $register Register to load
2 $address Address of start of string
3 $index Index into stringputLexicalCode($register, $address, $index, $code)
Put the specified lexical code into the current character in memory.
Parameter Description
1 $register Register used to load code
2 $address Address of string
3 $index Index into string
4 $code Code to putloadCurrentChar()
Load the details of the character currently being processed so that we have the index of the character in the upper half of the current character and the lexical type of the character in the lowest byte.
checkStackHas($depth)
Check that we have at least the specified number of elements on the stack.
Parameter Description
1 $depth Number of elements required on the stackpushElement()
Push the current element on to the stack.
pushEmpty()
Push the empty element on to the stack.
lexicalNameFromLetter($l)
Lexical name for a lexical item described by its letter.
Parameter Description
1 $l Letter of the lexical itemlexicalNumberFromLetter($l)
Lexical number for a lexical item described by its letter.
Parameter Description
1 $l Letter of the lexical itemlexicalItemLength($source32, $offset)
Put the length of a lexical item into variable size.
Parameter Description
1 $source32 B<address> of utf32 source representation
2 $offset B<offset> to lexical item in utf32new($depth, $description)
Create a new term in the parse tree rooted on the stack.
Parameter Description
1 $depth Stack depth to be converted
2 $description Text reason why we are creating a new termerror($message)
Write an error message and stop.
Parameter Description
1 $message Error messagetestSet($set, $register)
Test a set of items, setting the Zero Flag is one matches else clear the Zero flag.
Parameter Description
1 $set Set of lexical letters
2 $register Register to testcheckSet($set)
Check that one of a set of items is on the top of the stack or complain if it is not.
Parameter Description
1 $set Set of lexical lettersreduce($priority)
Convert the longest possible expression on top of the stack into a term at the specified priority.
Parameter Description
1 $priority Priority of the operators to reducereduceMultiple($priority)
Reduce existing operators on the stack.
Parameter Description
1 $priority Priority of the operators to reduceaccept_a()
Assign.
accept_b()
Open.
accept_B()
Closing parenthesis.
accept_d()
Infix but not assign or semi-colon.
accept_p()
Prefix.
accept_q()
Post fix.
accept_s()
Semi colon.
accept_v()
Variable.
parseExpression()
Parse the string of classified lexical items addressed by register $start of length $length. The resulting parse tree (if any) is returned in r15.
MatchBrackets(@parameters)
Replace the low three bytes of a utf32 bracket character with 24 bits of offset to the matching opening or closing bracket. Opening brackets have even codes from 0x10 to 0x4e while the corresponding closing bracket has a code one higher.
Parameter Description
1 @parameters ParametersClassifyNewLines(@parameters)
Scan input string looking for opportunities to convert new lines into semi colons.
Parameter Description
1 @parameters ParametersClassifyWhiteSpace(@parameters)
Classify white space per: "lib/Unisyn/whiteSpace/whiteSpaceClassification.pl".
Parameter Description
1 @parameters Parametersreload($parse, $parameters)
Reload the variables associated with a parse
Parameter Description
1 $parse Parse
2 $parameters Hash of variable parametersparseUtf8($parse, @parameters)
Parse a unisyn expression encoded as utf8 and return the parse tree.
Parameter Description
1 $parse Parse
2 @parameters ParametersprintLexicalItem($parse, $source32, $offset, $size)
Print the utf8 string corresponding to a lexical item at a variable offset.
Parameter Description
1 $parse Parse tree
2 $source32 B<address> of utf32 source representation
3 $offset B<offset> to lexical item in utf32
4 $size B<size> in utf32 chars of itemshowAlphabet($alphabet)
Show an alphabet.
Parameter Description
1 $alphabet Alphabet nameT($key, $expected, %options)
Parse some text and dump the results.
Parameter Description
1 $key Key of text to be parsed
2 $expected Expected result
3 %options OptionsC($key, $expected, %options)
Parse some text and print the results.
Parameter Description
1 $key Key of text to be parsed
2 $expected Expected result
3 %options OptionsIndex
1 accept_a - Assign.
2 accept_B - Closing parenthesis.
3 accept_b - Open.
4 accept_d - Infix but not assign or semi-colon.
5 accept_p - Prefix.
6 accept_q - Post fix.
7 accept_s - Semi colon.
8 accept_v - Variable.
9 ascii - Define a method for ascii text.
10 asciiToAssignGreek - Translate ascii to the corresponding letters in the assign greek alphabet.
11 asciiToAssignLatin - Translate ascii to the corresponding letters in the assign latin alphabet.
12 asciiToDyadGreek - Translate ascii to the corresponding letters in the dyad greek alphabet.
13 asciiToDyadLatin - Translate ascii to the corresponding letters in the dyad latin alphabet.
14 asciiToEscaped - Translate ascii to the corresponding letters in the escaped ascii alphabet.
15 asciiToPrefixGreek - Translate ascii to the corresponding letters in the prefix greek alphabet.
16 asciiToPrefixLatin - Translate ascii to the corresponding letters in the prefix latin alphabet.
17 asciiToSuffixGreek - Translate ascii to the corresponding letters in the suffix greek alphabet.
18 asciiToSuffixLatin - Translate ascii to the corresponding letters in the suffix latin alphabet.
19 asciiToVariableGreek - Translate ascii to the corresponding letters in the suffix greek alphabet.
20 asciiToVariableLatin - Translate ascii to the corresponding letters in the suffix latin alphabet.
21 assign - Define a method for an assign operator.
22 bracket - Define a method for a bracket operator.
23 C - Parse some text and print the results.
24 checkSet - Check that one of a set of items is on the top of the stack or complain if it is not.
25 checkStackHas - Check that we have at least the specified number of elements on the stack.
26 ClassifyNewLines - Scan input string looking for opportunities to convert new lines into semi colons.
27 ClassifyWhiteSpace - Classify white space per: "lib/Unisyn/whiteSpace/whiteSpaceClassification.
28 create - Create a new unisyn parse from a utf8 string.
29 dumpParseTree - Dump the parse tree.
30 dyad - Define a method for a dyadic operator.
31 error - Write an error message and stop.
32 getAlpha - Load the position of a lexical item in its alphabet from the current character.
33 getLexicalCode - Load the lexical code of the current character in memory into the specified register.
34 lexicalItemLength - Put the length of a lexical item into variable size.
35 lexicalNameFromLetter - Lexical name for a lexical item described by its letter.
36 lexicalNumberFromLetter - Lexical number for a lexical item described by its letter.
37 lexToSub - Map a lexical item to a processing subroutine.
38 loadCurrentChar - Load the details of the character currently being processed so that we have the index of the character in the upper half of the current character and the lexical type of the character in the lowest byte.
39 MatchBrackets - Replace the low three bytes of a utf32 bracket character with 24 bits of offset to the matching opening or closing bracket.
40 new - Create a new term in the parse tree rooted on the stack.
41 parseExpression - Parse the string of classified lexical items addressed by register $start of length $length.
42 parseUtf8 - Parse a unisyn expression encoded as utf8 and return the parse tree.
43 prefix - Define a method for a prefix operator.
44 print - Print a parse tree.
45 printLexicalItem - Print the utf8 string corresponding to a lexical item at a variable offset.
46 printOperatorSequence - Print the operator calling sequence.
47 pushElement - Push the current element on to the stack.
48 pushEmpty - Push the empty element on to the stack.
49 putLexicalCode - Put the specified lexical code into the current character in memory.
50 reduce - Convert the longest possible expression on top of the stack into a term at the specified priority.
51 reduceMultiple - Reduce existing operators on the stack.
52 reload - Reload the variables associated with a parse
53 semiColon - Define a method for the semicolon operator.
54 semiColonChar - Translate ascii to the corresponding letters in the escaped ascii alphabet.
55 showAlphabet - Show an alphabet.
56 suffix - Define a method for a suffix operator.
57 T - Parse some text and dump the results.
58 testSet - Test a set of items, setting the Zero Flag is one matches else clear the Zero flag.
59 traverseParseTree - Traverse the terms in parse tree in post order and call the operator subroutine associated with each term.
60 variable - Define a method for a variable.
Installation
This module is written in 100% Pure Perl and, thus, it is easy to read, comprehend, use, modify and install via cpan:
sudo cpan install Unisyn::ParseAuthor
Copyright
Copyright (c) 2016-2021 Philip R Brenan.
This module is free software. It may be used, redistributed and/or modified under the same terms as Perl itself.
1 POD Error
The following errors were encountered while parsing the POD:
- Around line 3607:
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