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Merge pull request #15 from ray-pH/multiline-text
Multiline text
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,152 @@ | ||
| // BBCode parser for multiline text object | ||
| // | ||
|
|
||
| enum BB_TokenType { | ||
| TEXT = "TEXT", | ||
| OPEN_TAG = "OPEN_TAG", | ||
| CLOSE_TAG = "CLOSE_TAG", | ||
| EOF = "EOF", | ||
| } | ||
| type BB_Token = { | ||
| type : BB_TokenType, | ||
| attributes : { [key: string]: string } | ||
| } | ||
|
|
||
| export class BB_Lexer { | ||
| static parse_tag_content(str : string) : BB_Token { | ||
| if (str[0] === "/") { | ||
| // close tag | ||
| let name = str.substring(1); | ||
| return { | ||
| type: BB_TokenType.CLOSE_TAG, | ||
| attributes: {_tag_name : name} | ||
| } | ||
| } | ||
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||
| // open tag | ||
| let space_id = str.indexOf(" "); | ||
| let equal_id = str.indexOf("="); | ||
| if (space_id === -1 && equal_id === -1) { | ||
| // [name] | ||
| return { | ||
| type: BB_TokenType.OPEN_TAG, | ||
| attributes: {_tag_name : str} | ||
| } | ||
| } | ||
| if (space_id === -1 && equal_id > 0) { | ||
| // [name=value] | ||
| let name = str.substring(0, equal_id); | ||
| let value = str.substring(equal_id + 1); | ||
| let attributes : any = {_tag_name : name} | ||
| attributes[name] = value; | ||
| return { | ||
| type: BB_TokenType.OPEN_TAG, | ||
| attributes | ||
| } | ||
| } | ||
| // [name attr1=value1 attr2=value2] | ||
| throw new Error("Unimplemented"); | ||
| } | ||
|
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| static parse(text : string) : BB_Token[] | null { | ||
| let tokens : BB_Token[] = []; | ||
|
|
||
| let pos = 0; | ||
| let len = text.length; | ||
| while (pos < len) { | ||
| // Find the next tag | ||
| // Find [ | ||
| let TagLeft = text.indexOf("[", pos); | ||
| if (TagLeft === -1) { | ||
| // no more tags, add the rest of the text | ||
| tokens.push({ | ||
| type: BB_TokenType.TEXT, | ||
| attributes: {_text : text.substring(pos)} | ||
| }); | ||
| break; | ||
| } | ||
| if (TagLeft > pos) { | ||
| // add the text before the [ | ||
| tokens.push({ | ||
| type: BB_TokenType.TEXT, | ||
| attributes: {_text : text.substring(pos, TagLeft)} | ||
| }); | ||
| } | ||
|
|
||
| // find ] | ||
| let TagRight = text.indexOf("]", TagLeft); | ||
| let nextTagLeft = text.indexOf("[", TagLeft + 1); | ||
| // make sure there is no [ between the [ and ] | ||
| if (nextTagLeft > 0 && nextTagLeft < TagRight) return null; | ||
| // make sure there is a ] after the [ | ||
| if (TagRight === -1) return null; | ||
|
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| let tag_content = text.substring(TagLeft + 1, TagRight); | ||
| tokens.push(BB_Lexer.parse_tag_content(tag_content)); | ||
|
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| pos = TagRight + 1; | ||
| } | ||
| return tokens; | ||
| } | ||
| } | ||
|
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| export class BB_multiline { | ||
| static from_BBCode(text : string, linespace : string = "1em") { | ||
| let tspans : {text : string, style : {}}[] = [] | ||
| let tag_stack : { [key: string]: string }[] = []; | ||
| let tokens = BB_Lexer.parse(text); | ||
| if (tokens === null) { | ||
| console.error("Invalid BBCode"); | ||
| return; | ||
| } | ||
| for (let token of tokens) { | ||
| switch (token.type) { | ||
| case BB_TokenType.OPEN_TAG: { | ||
| // if the token is [br] then add a new line | ||
| if (token.attributes['_tag_name'] === "br") { | ||
| tspans.push({text: "\n", style: {dy: linespace}}); | ||
| break; | ||
| } | ||
| tag_stack.push(token.attributes); | ||
| } break; | ||
| case BB_TokenType.CLOSE_TAG: { | ||
| if (tag_stack.length === 0) { | ||
| console.error("Invalid BBCode"); | ||
| return; | ||
| } | ||
| let tag_top = tag_stack[tag_stack.length - 1]; | ||
| if (tag_top['_tag_name'] !== token.attributes['_tag_name']) { | ||
| console.error("Invalid BBCode"); | ||
| return; | ||
| } | ||
| tag_stack.pop(); | ||
| } break; | ||
| case BB_TokenType.TEXT: { | ||
| let style = BB_multiline.build_style(tag_stack); | ||
| tspans.push({text: token.attributes['_text'], style}); | ||
| } break; | ||
| } | ||
| } | ||
|
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||
| return tspans; | ||
| } | ||
|
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| static build_style(tag_stack : { [key: string]: string }[]) { | ||
| let style : any = {}; | ||
| for (let tag of tag_stack) { | ||
| switch (tag['_tag_name']) { | ||
| case "b" : style["font-weight"] = "bold"; break; | ||
| case "i" : style["font-style"] = "italic"; break; | ||
| case "color" : style["fill"] = tag["color"]; break; | ||
| case "size" : style["font-size"] = tag["size"]; break; | ||
| case "dx" : style["dx"] = tag["dx"]; break; | ||
| case "dy" : style["dy"] = tag["dy"]; break; | ||
| case "font" : style["font-family"] = tag["font"]; break; | ||
| case "var" : style["textvar"] = true; break; | ||
| case "tag" : style["tag"] = tag["tag"]; break; | ||
| } | ||
| } | ||
| return style; | ||
| } | ||
| } | ||
|
|
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