Grammar - Revision history

Raffriff42: chaining - correction

2017-11-16T14:28:29Z

chaining - correction

Raffriff42: GScript - rephrase

2017-11-15T22:07:05Z

GScript - rephrase

Raffriff42: 'Statements', 'Expression' formatting; 'Functions' part rewrite; mention AVS+ Gscript; mention chaining of boolean expressions

2017-11-15T05:21:58Z

'Statements', 'Expression' formatting; 'Functions' part rewrite; mention AVS+ Gscript; mention chaining of boolean expressions

Show changes

Raffriff42: one more touch-up -- operators; max-width

2016-03-11T14:47:46Z

one more touch-up -- operators; max-width

Admin: /* Statements, Expressions, Types and Operators */

2016-01-31T19:15:07Z

‎Statements, Expressions, Types and Operators

Raffriff42: value of an expression, forms 5 and 6; more ternary

2016-01-25T20:50:10Z

value of an expression, forms 5 and 6; more ternary

Raffriff42: 'ternary' - add link

2016-01-24T19:08:18Z

'ternary' - add link

Raffriff42: constant - correction

2016-01-24T19:00:52Z

constant - correction

Raffriff42: typo

2016-01-24T18:27:19Z

typo

Raffriff42: one more touch-up

2016-01-24T18:21:31Z

one more touch-up

@@ Line 48: / Line 48: @@
 {{BoldColor|black|120|►}} Incidentally, Avisynth '''ignores case''': ''avisource'' or ''aViSouRCe'' is just as good as ''AVISource''.
-{{BoldColor|black|120|►}} As a special case, [[Operators#For_Booleans|boolean operations]] may be ''chained'':
+{{BoldColor|black|120|►}} As a special case, [[Operators|comparisons ]] may be ''chained'':
 :<code>(3 <= x <= 5)</code> can be used where normally something like
 :<code>(3 <= x && x <= 5)</code> would be required.<sup>[http://forum.doom9.org/showthread.php?p=1783132#post1783132 (doom9)]</sup>

← Older revision		Revision as of 22:07, 15 November 2017
Line 17:		Line 17:
	{{BoldColor\|black\|120\|►}} Two higher-level constructs also exist - the '''function declaration''' (dicussed below) and the '''[[Control_structures#The_try..catch_statement\|try..catch statement]]'''.		{{BoldColor\|black\|120\|►}} Two higher-level constructs also exist - the '''function declaration''' (dicussed below) and the '''[[Control_structures#The_try..catch_statement\|try..catch statement]]'''.

−	{{BoldColor\|black\|120\|►}} ~~{{AvsPluscon}} supports (via~~ [[GScript]]) '''~~{ statement blocks }~~''', '''for''' and '''while''' loops.	+	{{BoldColor\|black\|120\|►}} [[GScript]], a [[External_filters#Support_filters\|support plugin]], extends the language to include '''if–else''', '''for''' and '''while''' loops; {{AvsPluscon}} has [[GScript#Avisynth.2B\|native support of GScript]].

@@ Line 1: / Line 1: @@
 ==== Statements, Expressions, Types and Operators ====
 All basic AviSynth scripting '''statements''' have one of these ''forms'':
@@ Line 33: / Line 34: @@
 ::{{FuncArg|''expression''}} <b>.</b> {{FuncArg|function_name}} '''(''' {{FuncArg|argument_list}} ''')''' is equivalent to
 ::{{FuncArg|function_name}} '''(''' {{FuncArg|''expression''}} ''',''' {{FuncArg|argument_list}} ''')'''
-*The fifth form has an {{FuncArg|operator}}; AviSynth operators are discussed [[Operators|here]]; in addition to the normal math operators you would expect, there are several ''special'' operators; for example,
+*The fifth form has an {{FuncArg|operator}}; AviSynth operators are discussed [[Operators|'''here''']]; in addition to the normal math operators you would expect, there are several ''special'' operators; for example,
-:*'''strings''' can be ''concatenated'' (joined together) with '+', and ''compared'' with relational operators.
+:*'''strings''' can be ''concatenated'' (joined together) with '+', and ''compared'' with relational operators like '>='.
 :*'''video clips''' can be ''spliced'' (joined together) with '+':
 ::''a'' '''+''' ''b'' is equivalent to [[Splice|UnalignedSplice]](''a'', ''b'')
@@ Line 174: / Line 175: @@
   Trim(0,9) '''[*''' select some frames '''*] \'''
     + Trim(20,29)
 </div>

@@ Line 13: / Line 13: @@
 As a shorthand, if '''return''' is not present in the final executable statement of a script (or script block), it is ''implied'' &ndash; the statement is treated as if '''return''' was present.
-Most of the time the '''result''' of an expression will be a video clip; however an expression's result can be any '''[[Script_variables|Avisynth Type]]''' (clip, int, float, bool, string) &ndash; these are sometimes called ''utility functions''. A guide to the built-in utility functions can be found [[Internal_functions|here]].
+Most of the time the '''result''' of an expression will be a video clip; however an expression's result can be any type supported by AviSynth (clip, int, float, bool, string) and this is how ''utility functions'' such as [[Internal_functions|Internal script functions]] operate.
 If the return value of the script is a ''clip'', which is the normal case, it can be "played" as a video by a [[Frameserver|frameserving]] client.
@@ Line 47: / Line 47: @@
 Incidentally, Avisynth '''ignores case''': ''avisource'' or ''aViSouRCe'' is just as good as ''AVISource''.
 ==== Functions, Filters and Arguments ====

@@ Line 24: / Line 24: @@
 # {{FuncArg|function_name}} '''(''' {{FuncArg|argument_list}} ''')'''
 # {{FuncArg|expression}} <b>.</b> {{FuncArg|function_name}} '''(''' {{FuncArg|argument_list}} ''')'''
-# {{FuncArg|expression}} '''operator''' {{FuncArg|expression}}
+# {{FuncArg|expression1}} '''operator''' {{FuncArg|expression2}}
-# {{FuncArg|boolean_expression}} <b>?</b> {{FuncArg|expression}} <b>:</b> {{FuncArg|expression}}
+# {{FuncArg|expression1}} <b>?</b> {{FuncArg|expression2}} <b>:</b> {{FuncArg|expression3}}
 *In the first form, the value of the expression is the value of the (numeric, string or boolean) {{FuncArg|constant}}&mdash;a ''literal value'' such as '42'.
@@ Line 33: / Line 33: @@
 ::{{FuncArg|''expression''}} <b>.</b> {{FuncArg|function_name}} '''(''' {{FuncArg|argument_list}} ''')''' is equivalent to
 ::{{FuncArg|function_name}} '''(''' {{FuncArg|''expression''}} ''',''' {{FuncArg|argument_list}} ''')'''
-*The fifth form has an {{FuncArg|operator}}; AviSynth operators are discussed [[Operators|here]]; for example,
+*The fifth form has an {{FuncArg|operator}}; AviSynth operators are discussed [[Operators|here]]; in addition to the normal math operators you would expect, there are several ''special'' operators; for example,
 :*'''strings''' can be ''concatenated'' (joined together) with '+', and ''compared'' with relational operators.
 :*'''video clips''' can be ''spliced'' (joined together) with '+':
 ::''a'' '''+''' ''b'' is equivalent to [[Splice|UnalignedSplice]](''a'', ''b'')
 ::''a'' '''++''' ''b'' is equivalent to [[Splice|AlignedSplice]](''a'', ''b'').
-*The sixth form supports conditional execution with the {{FuncArg|a?b:c}} [[Ternary_operator|''ternary operator'']].
+:The value of the expression will depend on the specific operator; for example,
-Avisynth '''ignores case''': ''avisource'' or ''aViSouRCe'' is just as good as ''AVISource''.
+Incidentally, Avisynth '''ignores case''': ''avisource'' or ''aViSouRCe'' is just as good as ''AVISource''.

@@ Line 20: / Line 20: @@
 An '''Expression''' can have one of these forms:
-# {{FuncArg|constant_name}}
+# {{FuncArg|constant}}
 # {{FuncArg|variable_name}} or {{FuncArg|clip_property_name}}
 # {{FuncArg|function_name}} '''(''' {{FuncArg|argument_list}} ''')'''
@@ Line 27: / Line 27: @@
 # {{FuncArg|boolean_expression}} <b>?</b> {{FuncArg|expression}} <b>:</b> {{FuncArg|expression}}
-*In the first form, the value of the expression is the value of the (numeric, string or boolean) {{FuncArg|constant}}. <br>(syntactically, a ''constant'' is indistinguishable from a ''variable''; by convention, you set the value of a ''constant'' once and once only)
+*In the first form, the value of the expression is the value of the (numeric, string or boolean) {{FuncArg|constant}}&mdash;a ''literal value'' such as '42'.
 *In the second form, the value equals the value of the specified [[Script_variables|{{FuncArg|variable}}]] or [[Clip_properties|{{FuncArg|clip property}}]] (possibly [[Internal_functions/Defined#Defined|undefined]]).
 *In the third form, the value is the return value of a {{FuncArg|function}} (see below).

@@ Line 61: / Line 61: @@
 The list can be '''empty'''. If so, you can omit the '''parentheses''':
 <div {{BoxWidthIndent|48|1}} >
-  AviSource("my.avi").AssumeFieldBased.AssumeTFF.SeparateFields
+  AviSource("my.avi").AssumeFrameBased.AssumeTFF.SeparateFields
 </div>
 versus
 <div {{BoxWidthIndent|48|1}} >
-  AviSource("my.avi").AssumeFieldBased().AssumeTFF().SeparateFields()
+  AviSource("my.avi").AssumeFrameBased().AssumeTFF().SeparateFields()
 </div>