Idiomatically determine all the characters that can be used for symbols: Difference between revisions
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Unicode Identifier start: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzªµºÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐ... |
Unicode Identifier start: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzªµºÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐ... |
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Unicode Identifier part: [0][1][2][3][4][5][6][7][8][14][15][16][17][18][19][20][21][22][23][24][25][26][27][48][49]...</pre> |
Unicode Identifier part: [0][1][2][3][4][5][6][7][8][14][15][16][17][18][19][20][21][22][23][24][25][26][27][48][49]...</pre> |
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=={{header|jq}}== |
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===jq identifiers=== |
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Excluding key names from consideration, in jq 1.4 the set of characters that can be |
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used in jq identifiers corresponds to the regex: [A-Za-z0-9$_]. |
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Thus, assuming the availability of test/1 as a builtin, the test in jq |
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for a valid identifier character is: test("[A-Za-z0-9$_]"). |
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To generate a string of such characters idiomatically: |
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<lang jq>[range(0;128) | [.] | implode | select(test("[A-Za-z0-9$_]"))] | add</lang> |
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jq 1.5 also allows ":" as a joining character in the form "module::name". |
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===JSON key names=== |
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Any JSON string can be used as a key. Accordingly, |
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some characters must be entered as escaped character sequences, |
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e.g. \u0000 for NUL, \\ for backslash, etc. Thus any Unicode character |
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except for the control characters can appear in a jq key. |
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Therefore, assuming the availability in jq of the test/1 builtin, the test |
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in jq for whether a character can appear literally in a jq identifier or key is: |
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<lang jq>test("[^\u0000-\u0007F]")</lang> |
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===Symbols=== |
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The following function screens for characters by "\p" class: |
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<lang jq>def is_character(class): |
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test( "\\p{" + class + "}" );</lang> |
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For example, to test whether a character is a Unicode letter, symbol or numeric character: |
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<lang jq>is_character("L") or is_character("S") or is_character("N")</lang> |
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An efficient way to count the number of Unicode characters within a character class is |
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to use the technique illustrated by the following function: |
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<lang jq>def count(class; m; n): |
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reduce (range(m;n) | [.] | implode | select( test( "\\p{" + class + "}" ))) as $i |
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(0; . + 1);</lang> |
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For example the number of Unicode "symbol" characters can be obtained by evaluating: |
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<lang jq>count("S"; 0; 1114112)</lang> |
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The result is 3958. |
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=={{header|ooRexx}}== |
=={{header|ooRexx}}== |
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