mirror of https://github.com/lark-parser/lark.git
71 lines
2.3 KiB
Python
71 lines
2.3 KiB
Python
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from __future__ import absolute_import
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import unittest
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import logging
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import os
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import sys
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logging.basicConfig(level=logging.INFO)
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from lark.tools.nearley import create_code_for_nearley_grammar
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NEARLEY_PATH = os.path.abspath(os.path.join(os.path.dirname(__file__), 'nearley'))
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BUILTIN_PATH = os.path.join(NEARLEY_PATH, 'builtin')
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class TestNearley(unittest.TestCase):
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def test_css(self):
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css_example_grammar = """
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# http://www.w3.org/TR/css3-color/#colorunits
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@builtin "whitespace.ne"
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@builtin "number.ne"
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@builtin "postprocessors.ne"
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csscolor -> "#" hexdigit hexdigit hexdigit hexdigit hexdigit hexdigit {%
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function(d) {
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return {
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"r": parseInt(d[1]+d[2], 16),
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"g": parseInt(d[3]+d[4], 16),
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"b": parseInt(d[5]+d[6], 16),
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}
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}
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%}
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| "#" hexdigit hexdigit hexdigit {%
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function(d) {
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return {
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"r": parseInt(d[1]+d[1], 16),
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"g": parseInt(d[2]+d[2], 16),
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"b": parseInt(d[3]+d[3], 16),
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}
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}
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%}
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| "rgb" _ "(" _ colnum _ "," _ colnum _ "," _ colnum _ ")" {% $({"r": 4, "g": 8, "b": 12}) %}
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| "hsl" _ "(" _ colnum _ "," _ colnum _ "," _ colnum _ ")" {% $({"h": 4, "s": 8, "l": 12}) %}
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| "rgba" _ "(" _ colnum _ "," _ colnum _ "," _ colnum _ "," _ decimal _ ")" {% $({"r": 4, "g": 8, "b": 12, "a": 16}) %}
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| "hsla" _ "(" _ colnum _ "," _ colnum _ "," _ colnum _ "," _ decimal _ ")" {% $({"h": 4, "s": 8, "l": 12, "a": 16}) %}
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hexdigit -> [a-fA-F0-9]
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colnum -> unsigned_int {% id %} | percentage {%
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function(d) {return Math.floor(d[0]*255); }
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%}
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"""
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code = create_code_for_nearley_grammar(css_example_grammar, 'csscolor', BUILTIN_PATH, './')
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d = {}
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exec (code, d)
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parse = d['parse']
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c = parse('#a199ff')
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assert c['r'] == 161
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assert c['g'] == 153
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assert c['b'] == 255
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c = parse('rgb(255, 70%, 3)')
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assert c['r'] == 255
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assert c['g'] == 178
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assert c['b'] == 3
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if __name__ == '__main__':
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unittest.main()
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