From fad15f79b1230b3076be515d6894c8919562809b Mon Sep 17 00:00:00 2001
From: mitchell <unknown>
Date: Sat, 25 Apr 2020 16:26:31 -0400
Subject: Reformatted Lua LPeg lexers and added new convenience functions and
 pattern. `lexer.range()` replaces `lexer.delimited_range()` and
 `lexer.nested_pair()`. `lexer.to_eol()` replaces `patt * lexer.nonnewline^0`
 constructs. `lexer.number` replaces `lexer.float + lexer.integer`. Also added
 unit tests for lexer functions.

---
 lexlua/html.lua | 33 ++++++++++++++-------------------
 1 file changed, 14 insertions(+), 19 deletions(-)

(limited to 'lexlua/html.lua')

diff --git a/lexlua/html.lua b/lexlua/html.lua
index b77d8453c..465a828b6 100644
--- a/lexlua/html.lua
+++ b/lexlua/html.lua
@@ -12,12 +12,11 @@ local ws = token(lexer.WHITESPACE, lexer.space^1)
 lex:add_rule('whitespace', ws)
 
 -- Comments.
-lex:add_rule('comment', token(lexer.COMMENT, '<!--' * (lexer.any - '-->')^0 *
-                                             P('-->')^-1))
+lex:add_rule('comment', token(lexer.COMMENT, lexer.range('<!--', '-->')))
 
 -- Doctype.
-lex:add_rule('doctype', token('doctype', '<!' * word_match([[doctype]], true) *
-                                         (lexer.any - '>')^1 * '>'))
+lex:add_rule('doctype', token('doctype',
+  lexer.range('<!' * word_match([[doctype]], true), '>')))
 lex:add_style('doctype', lexer.STYLE_COMMENT)
 
 -- Elements.
@@ -37,12 +36,12 @@ local paired_element = token('element', '<' * P('/')^-1 * word_match([[
 ]], true))
 local known_element = single_element + paired_element
 local unknown_element = token('unknown_element', '<' * P('/')^-1 *
-                                                 (lexer.alnum + '-')^1)
+  (lexer.alnum + '-')^1)
 local element = known_element + unknown_element
 lex:add_rule('element', element)
 lex:add_style('single_element', lexer.STYLE_KEYWORD)
 lex:add_style('element', lexer.STYLE_KEYWORD)
-lex:add_style('unknown_element', lexer.STYLE_KEYWORD..',italics')
+lex:add_style('unknown_element', lexer.STYLE_KEYWORD .. ',italics')
 
 -- Closing tags.
 local tag_close = token('element', P('/')^-1 * '>')
@@ -66,7 +65,7 @@ local unknown_attribute = token('unknown_attribute', (lexer.alnum + '-')^1)
 local attribute = (known_attribute + unknown_attribute) * #(lexer.space^0 * '=')
 lex:add_rule('attribute', attribute)
 lex:add_style('attribute', lexer.STYLE_TYPE)
-lex:add_style('unknown_attribute', lexer.STYLE_TYPE..',italics')
+lex:add_style('unknown_attribute', lexer.STYLE_TYPE .. ',italics')
 
 -- TODO: performance is terrible on large files.
 local in_tag = P(function(input, index)
@@ -83,17 +82,16 @@ local equals = token(lexer.OPERATOR, '=') --* in_tag
 
 -- Strings.
 local string = #S('\'"') * lexer.last_char_includes('=') *
-               token(lexer.STRING, lexer.delimited_range("'") +
-                                   lexer.delimited_range('"'))
+  token(lexer.STRING, lexer.range("'") + lexer.range('"'))
 lex:add_rule('string', string)
 
 -- Numbers.
 lex:add_rule('number', #lexer.digit * lexer.last_char_includes('=') *
-                       token(lexer.NUMBER, lexer.digit^1 * P('%')^-1))--*in_tag)
+  token(lexer.NUMBER, lexer.digit^1 * P('%')^-1))--*in_tag)
 
 -- Entities.
 lex:add_rule('entity', token('entity', '&' * (lexer.any - lexer.space - ';')^1 *
-                                       ';'))
+  ';'))
 lex:add_style('entity', lexer.STYLE_COMMENT)
 
 -- Fold points.
@@ -113,15 +111,13 @@ lex:add_fold_point(lexer.COMMENT, '<!--', '-->')
 -- Tags that start embedded languages.
 -- Export these patterns for proxy lexers (e.g. ASP) that need them.
 lex.embed_start_tag = element *
-                      (ws * attribute * ws^-1 * equals * ws^-1 * string)^0 *
-                      ws^-1 * tag_close
+  (ws * attribute * ws^-1 * equals * ws^-1 * string)^0 * ws^-1 * tag_close
 lex.embed_end_tag = element * tag_close
 
 -- Embedded CSS (<style type="text/css"> ... </style>).
 local css = lexer.load('css')
 local style_element = word_match([[style]], true)
-local css_start_rule = #(P('<') * style_element *
-                         ('>' + P(function(input, index)
+local css_start_rule = #('<' * style_element * ('>' + P(function(input, index)
   if input:find('^%s+type%s*=%s*(["\'])text/css%1', index) then
     return index
   end
@@ -132,8 +128,7 @@ lex:embed(css, css_start_rule, css_end_rule)
 -- Embedded JavaScript (<script type="text/javascript"> ... </script>).
 local js = lexer.load('javascript')
 local script_element = word_match([[script]], true)
-local js_start_rule = #(P('<') * script_element *
-                        ('>' + P(function(input, index)
+local js_start_rule = #('<' * script_element * ('>' + P(function(input, index)
   if input:find('^%s+type%s*=%s*(["\'])text/javascript%1', index) then
     return index
   end
@@ -142,13 +137,13 @@ local js_end_rule = #('</' * script_element * ws^-1 * '>') * lex.embed_end_tag
 local js_line_comment = '//' * (lexer.nonnewline_esc - js_end_rule)^0
 local js_block_comment = '/*' * (lexer.any - '*/' - js_end_rule)^0 * P('*/')^-1
 js:modify_rule('comment', token(lexer.COMMENT, js_line_comment +
-                                               js_block_comment))
+  js_block_comment))
 lex:embed(js, js_start_rule, js_end_rule)
 
 -- Embedded CoffeeScript (<script type="text/coffeescript"> ... </script>).
 local cs = lexer.load('coffeescript')
 local script_element = word_match([[script]], true)
-local cs_start_rule = #(P('<') * script_element * P(function(input, index)
+local cs_start_rule = #('<' * script_element * P(function(input, index)
   if input:find('^[^>]+type%s*=%s*(["\'])text/coffeescript%1', index) then
     return index
   end
-- 
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