syntax-parser-prototype 2.0

prototype of a sytaxparser

python3 -m pip install syntax-parser-prototype
python3 -m pip install syntax-parser-prototype[visualisation]

syntax-parser-prototype

Basic objects for the specific implementation of a syntax parser.

Object categories

[.*]Token

(Parsing result) single token

[.*]Branch

(Parsing result) container for tokens

Root[.*]

objects for the top level (not intended for modification)

Phrase

configuration object whose behavior is to be implemented by modifying the class.

The main behavior is implemented by the more detailed definition of the start and end methods. Additional predetermined interfaces are also declared in the corresponding docstrings.

Nesting, branches, and suffixes are defined by passing additional phrase derivatives to a instace.

Parsing

The top-level object RootPhrase provides the entry points for the parsing process. The result will be a RootTokenBranch.

Visualisation

The visualization module provides some support for debugging. All necessary packages can be installed separately.

python3 -m pip install syntax-parser-prototype[visualisation]

Overview

visualisation.start_structure_graph_app(root)

visualisation.html_on_server(result)

print(visualisation.pretty_xml_result(result))

<?xml version="1.0" ?>
<RB phrase="#root">
    <RN coord="0:0:0">''</RN>
    <B phrase="consoleline">
        <N coord="0:0:3">'&gt;&gt;&gt;'</N>
        <T coord="0:3:4">' '</T>
        <B phrase="function">
            <N coord="0:4:16">'prettyprint('</N>
            <B phrase="string">
                <N coord="0:16:17">"'"</N>
                <T coord="0:17:66">'( (a * b / (c + a)) * (b / (c – a) * b) / c ) + a'</T>
                <N coord="0:66:67">"'"</N>
            </B>
            <N coord="0:67:68">')'</N>
        </B>
        <N coord="0:68:68">''</N>
    </B>
    <RT coord="0:68:69">'\n'</RT>
    <B phrase="bracket">
        <N coord="1:0:1">'('</N>
        <T coord="1:1:2">'\n'</T>
        <T coord="2:0:3">'   '</T>
        <B phrase="bracket">
            <N coord="2:3:4">'('</N>
            <T coord="2:4:5">'\n'</T>
            <T coord="3:0:7">'       '</T>
            <T coord="3:7:8">'a'</T>
            <T coord="3:8:9">' '</T>
            <T coord="3:9:10">'*'</T>
            <T coord="3:10:11">' '</T>
            <T coord="3:11:12">'b'</T>
            <T coord="3:12:13">' '</T>
            <T coord="3:13:14">'/'</T>
            <T coord="3:14:15">' '</T>
            <B phrase="bracket">
                <N coord="3:15:16">'('</N>
                <T coord="3:16:17">'c'</T>
                <T coord="3:17:18">' '</T>
                <T coord="3:18:19">'+'</T>
                <T coord="3:19:20">' '</T>
                <T coord="3:20:21">'a'</T>
                <N coord="3:21:22">')'</N>
            </B>
            <T coord="3:22:23">'\n'</T>
            <T coord="4:0:3">'   '</T>
            <N coord="4:3:4">')'</N>
        </B>
        <T coord="4:4:5">' '</T>
        <T coord="4:5:6">'*'</T>
        <T coord="4:6:7">' '</T>
        <B phrase="bracket">
            <N coord="4:7:8">'('</N>
            <T coord="4:8:9">'\n'</T>
            <T coord="5:0:7">'       '</T>
            <T coord="5:7:8">'b'</T>
            <T coord="5:8:9">' '</T>
            <T coord="5:9:10">'/'</T>
            <T coord="5:10:11">' '</T>
            <B phrase="bracket">
                <N coord="5:11:12">'('</N>
                <T coord="5:12:13">'c'</T>
                <T coord="5:13:16">' – '</T>
                <T coord="5:16:17">'a'</T>
                <N coord="5:17:18">')'</N>
            </B>
            <T coord="5:18:19">' '</T>
            <T coord="5:19:20">'*'</T>
            <T coord="5:20:21">' '</T>
            <T coord="5:21:22">'b'</T>
            <T coord="5:22:23">'\n'</T>
            <T coord="6:0:3">'   '</T>
            <N coord="6:3:4">')'</N>
        </B>
        <T coord="6:4:5">' '</T>
        <T coord="6:5:6">'/'</T>
        <T coord="6:6:7">' '</T>
        <T coord="6:7:8">'c'</T>
        <T coord="6:8:10">' \n'</T>
        <N coord="7:0:1">')'</N>
    </B>
    <RT coord="7:1:2">' '</RT>
    <T coord="7:2:3">'+'</T>
    <RT coord="7:3:4">' '</RT>
    <T coord="7:4:5">'a'</T>
    <RT coord="7:5:6">'\n'</RT>
    <RT coord="8:0:1">'\n'</RT>
    <B phrase="consoleline">
        <N coord="9:0:3">'&gt;&gt;&gt;'</N>
        <T coord="9:3:4">' '</T>
        <B phrase="function">
            <N coord="9:4:8">'int('</N>
            <B phrase="string">
                <N coord="9:8:9">'"'</N>
                <T coord="9:9:11">'42'</T>
                <N coord="9:11:12">'"'</N>
                <B phrase="angular brackets">
                    <N coord="9:12:13">'['</N>
                    <T coord="9:13:16">'1:3'</T>
                    <N coord="9:16:17">']'</N>
                </B>
            </B>
            <T coord="9:17:18">' '</T>
            <T coord="9:18:19">'+'</T>
            <T coord="9:19:20">' '</T>
            <B phrase="string">
                <N coord="9:20:21">'"'</N>
                <T coord="9:21:22">'3'</T>
                <N coord="9:22:23">'"'</N>
            </B>
            <N coord="9:23:24">')'</N>
        </B>
        <T coord="9:24:25">' '</T>
        <T coord="9:25:26">'+'</T>
        <T coord="9:26:27">' '</T>
        <T coord="9:27:29">'19'</T>
        <N coord="9:29:29">''</N>
    </B>
    <RT coord="9:29:30">'\n'</RT>
    <T coord="10:0:2">'42'</T>
    <RT coord="10:2:3">'\n'</RT>
    <RN coord="10:3:3">''</RN>
</RB>